638 lines
21 KiB
Markdown
638 lines
21 KiB
Markdown
# HEADROOM
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## Resource Planning & Capacity Management System
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**Executive Summary & Technical Specification**
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---
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**Project Owner:** Santhosh J
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**Date:** February 17, 2026
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**Version:** 1.0
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**Status:** Approved for Development
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---
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## Table of Contents
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1. [Executive Overview](#executive-overview)
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2. [The Problem](#the-problem)
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3. [The Solution](#the-solution)
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4. [Technical Architecture](#technical-architecture)
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5. [Core Features](#core-features)
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6. [Quality Standards](#quality-standards)
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7. [Timeline & Phases](#timeline--phases)
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8. [Success Metrics](#success-metrics)
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---
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## Executive Overview
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### What is Headroom?
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Headroom is a web-based resource planning and capacity management tool designed to solve the allocation chaos faced by engineering managers juggling multiple projects and team members.
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**The Name:** "Headroom" captures the central question managers ask daily: "Do we have headroom for this new work?"
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### The Business Case
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**Current State:** Managing 10-15 developers across 10-12 concurrent projects using spreadsheets
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- Manual capacity calculations prone to errors
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- No validation mechanisms
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- Billing errors (over-allocation → overcharge, under-allocation → undercharge)
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- No visibility into team capacity
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- No audit trail
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**Future State:** Structured system that:
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- Automates capacity calculations
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- Validates allocations against estimates
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- Prevents billing errors before they happen
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- Provides clear visibility into team headroom
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- Tracks planned vs actual hours
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**ROI:** Manager time savings: 2+ hours → <30 minutes per monthly allocation cycle
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---
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## The Problem
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### Pain Points
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**1. Capacity Calculation Chaos**
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- Manual calculations across holidays, PTO, weekends
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- No systematic way to track who's available when
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- Hard to answer: "Who has capacity for new work?"
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**2. Billing Errors**
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- **Over-allocation:** More hours allocated than approved estimate → Overcharge client → Escalations
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- **Under-allocation:** Fewer hours allocated than approved estimate → Undercharge → Revenue loss
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- Both scenarios are unacceptable: "This money is my salary!"
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**3. No Validation**
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- Easy to over-allocate people or projects
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- No warnings when allocations exceed capacity
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- Spreadsheet formulas break, go unnoticed
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**4. Visibility Gap**
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- Can't easily see team utilization
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- Hard to compare planned vs actual hours
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- No forecasting capability
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**5. No Audit Trail**
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- Changes are invisible
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- Can't track who changed what allocation when
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---
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## The Solution
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### The Monthly Cycle
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Headroom organizes work around monthly capacity planning cycles:
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```
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┌─────────────────────────────────────────────────────────┐
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│ MONTHLY CYCLE │
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├─────────────────────────────────────────────────────────┤
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│ │
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│ 1. CAPACITY PLANNING │
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│ • Define team members (name, role, rate) │
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│ • Mark holidays, PTO, weekends │
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│ • Set daily availability (0, 0.5, 1.0) │
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│ OUTPUT: Individual & team capacity, revenue potential│
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│ │
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│ 2. PROJECT SETUP │
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│ • Track project status (lifecycle states) │
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│ • Define approved estimate (billable hours) │
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│ • Forecast effort across months │
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│ OUTPUT: Month-wise forecast, over/under indicators │
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│ │
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│ 3. RESOURCE ALLOCATION │
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│ • Allocate hours per person per project per month │
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│ • Validate: allocation ≤ capacity, allocation = estimate│
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│ • Track "untracked" resources (external teams) │
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│ OUTPUT: Clear allocation view, RED/YELLOW flags │
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│ │
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│ 4. ACTUALS TRACKING │
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│ • Team members log hours worked (monthly) │
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│ • Calculate utilization (planned vs actual) │
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│ OUTPUT: Running & overall utilization metrics │
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│ │
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└─────────────────────────────────────────────────────────┘
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```
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### Four Personas
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| Persona | Primary Use Case |
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|---------|------------------|
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| **Superuser** | System setup, configuration, master data management |
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| **Manager** | Resource planning, allocation, team oversight, approve estimates |
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| **Developer** | View allocations, log hours, understand own workload |
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| **Top Brass** | Executive reports, forecasts, budget visibility (read-only) |
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### Key Validation Rules
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**Over/Under Allocation Detection:**
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- **GREEN:** Allocation = Approved estimate (100%)
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- **YELLOW:** Under-allocated (<100%) → Will undercharge
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- **RED:** Over-allocated (>100%) → Will overcharge
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**Both under and over are flagged.** The goal: Always allocate 100% of approved estimate.
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---
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## Technical Architecture
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### System Overview
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```
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┌─────────────────────────────────────────────────────────┐
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│ ARCHITECTURE │
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├─────────────────────────────────────────────────────────┤
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│ │
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│ FRONTEND (SvelteKit - Port 5173) │
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│ • Tailwind CSS + DaisyUI (UI components) │
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│ • Recharts (visualizations) │
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│ • TanStack Table (data grids) │
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│ • Superforms + Zod (form validation) │
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│ • Vitest (unit tests) + Playwright (E2E tests) │
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│ │
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│ BACKEND (Laravel API - Port 3000) │
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│ • Laravel 12 (latest, PHP 8.4) │
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│ • Laravel API Resources (consistent JSON) │
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│ • JWT Authentication (tymon/jwt-auth) │
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│ • Laravel Scribe (SwaggerUI API docs) │
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│ • PHPUnit + Pest (testing) │
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│ │
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│ DATA LAYER │
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│ • PostgreSQL (latest) (primary database) │
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│ • Redis (latest) (query + response caching) │
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│ │
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│ INFRASTRUCTURE │
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│ • Docker Compose (4 containers) │
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│ • Nginx Proxy Manager (reverse proxy) │
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│ • Code-mounted volumes (hot reload) │
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│ • .env configuration (all environments) │
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│ │
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└─────────────────────────────────────────────────────────┘
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```
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### Why These Choices?
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**SvelteKit:**
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- Modern, reactive framework
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- Great for data-heavy dashboards
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- Smaller bundle sizes
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- Chosen over Vue/React for learning/modernization
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**Laravel:**
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- Project owner has PHP background
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- Robust API development framework
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- Rich ecosystem (Scribe, Pest, Pint)
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- Excellent PostgreSQL support
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**PostgreSQL:**
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- Production-grade from day 1 (avoid SQLite migration)
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- JSON operators for flexible queries
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- Better for reporting queries
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**Redis:**
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- Caching from day 1 (avoid refactoring debt)
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- Query caching + response caching
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- Automatic cache invalidation
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**JWT Authentication:**
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- Token-based (suitable for SPA)
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- Future-ready (easier mobile support later)
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### Deployment Architecture
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**Local Development:**
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- 4 Docker containers (frontend, backend, postgres, redis)
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- Code-mounted volumes (hot reload, no rebuild)
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- Docker Compose orchestration
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**Production:**
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- Same containerized setup
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- Nginx Proxy Manager routes:
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- `/` → SvelteKit
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- `/api/*` → Laravel API
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---
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## Core Features
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### 1. Capacity Planning
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**Inputs:**
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- Team member: Name, role, hourly rate
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- Calendar: Holidays, weekends
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- PTO requests
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- Daily availability: 0 (unavailable), 0.5 (half day), 1.0 (full day)
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**Outputs:**
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- Individual capacity (person-days per month)
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- Team capacity (total available person-days)
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- Possible revenue (if fully utilized)
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**Key Insight:** Availability is per-person, per-day. "1.0" means 100% of a productive day (hours per day configurable).
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---
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### 2. Project Management
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**Project Lifecycle:**
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```
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NA/Support → Initial → Gathering Estimates → Estimate Pending Approval
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↓
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Estimate Rework ←───────┘
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↓
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Estimate Approved → Funded → Scheduled → In-Progress
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↓
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Ready for Prod → Done
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↓
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[Optional: On-Hold, Cancelled]
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```
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**Key Attributes:**
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- **Approved Estimate:** Total billable hours approved by client
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- **Forecasted Effort:** Month-by-month breakdown of those hours
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- **Type:** Project (billable) vs Support (ongoing ops)
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**Validation:**
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- Sum of forecasted effort must equal approved estimate (±5% tolerance)
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- Alerts when monthly team allocation exceeds team capacity
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---
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### 3. Resource Allocation
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**The Allocation Matrix:**
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For a given month, view all projects vs all team members:
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```
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┌──────────────────────────────────────────────────────┐
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│ Project │ Dev A │ Dev B │ Dev C │ Untracked │ Total│
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├────────────┼───────┼───────┼───────┼───────────┼─────┤
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│ Project X │ 40h │ 20h │ 0 │ 10h │ 70h │
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│ Project Y │ 20h │ 40h │ 30h │ 0 │ 90h │
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│ Project Z │ 0 │ 80h │ 60h │ 0 │140h │
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├────────────┼───────┼───────┼───────┼───────────┼─────┤
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│ Total │ 60h │ 140h │ 90h │ 10h │300h │
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│ Capacity │ 160h │ 160h │ 120h │ ∞ │440h │
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│ % Util │ 38% │ 88% │ 75% │ N/A │ 68% │
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└──────────────────────────────────────────────────────┘
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```
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**Features:**
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- Visual indicators: GREEN (100%), YELLOW (<100%), RED (>100%)
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- "Untracked" resource for external team time (not billed)
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- Inline editing
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- Sortable, filterable
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**Validation Rules:**
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- Cannot allocate negative hours
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- Cannot allocate more than person's capacity (warning)
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- Sum of project allocations should equal approved estimate (±5%)
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---
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### 4. Actuals & Utilization
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**Data Entry:**
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- Team members log hours worked per project per month
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- Manual entry (monthly aggregate, can update weekly incrementally)
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- No time-tracking tool integration (MVP)
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**Calculations:**
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- **Running Utilization:** (Allocated hours YTD) / (Capacity YTD) × 100%
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- **Overall Utilization:** (Allocated hours this month) / (Capacity this month) × 100%
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- **Variance:** Actual hours - Allocated hours
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**Display:**
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- Utilization % shown alongside capacity view
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- Color-coded (low, optimal, high utilization)
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---
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### 5. Reports & Analytics
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**Core Reports:**
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| Report | Purpose | Filters |
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|--------|---------|---------|
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| **Forecast Summary** | Multi-period view of allocations and revenue | Date range, team, project, status |
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| **Utilization Summary** | Team and individual utilization trends | Date range, team member, role |
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| **Cost Summary** | Revenue forecasts based on allocations × rates | Date range, project, client |
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| **Allocation Report** | Who's allocated to what, month-by-month | Month, team, project |
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| **Variance Report** | Planned vs Actual analysis | Date range, project, person |
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**All reports:**
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- Highly customizable filters
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- On-screen display (PDF/CSV export deferred to Phase 2)
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- Cached for performance (Redis)
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---
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### 6. Role-Based Access Control (RBAC)
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**Permission Matrix:**
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| Action | Superuser | Manager | Developer | Top Brass |
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|--------|-----------|---------|-----------|-----------|
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| View all projects | ✅ | ✅ (read-only for others') | ❌ (assigned only) | ✅ (read-only) |
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| Create/edit projects | ✅ | ✅ (own projects) | ❌ | ❌ |
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| Allocate resources | ✅ | ✅ (own team only) | ❌ | ❌ |
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| View allocations | ✅ | ✅ | ✅ (own only) | ✅ |
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| Log hours | ✅ | ✅ | ✅ | ❌ |
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| View reports | ✅ | ✅ | ❌ | ✅ |
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| Configure system | ✅ | ❌ | ❌ | ❌ |
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---
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## Quality Standards
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### Testing Requirements
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**Every change must include:**
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1. **Unit tests** (backend: PHPUnit, frontend: Vitest)
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2. **E2E tests** (Playwright)
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3. **Regression tests** (full suite on each change)
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**Coverage Target:** >70% (enforced in `/opsx-verify`)
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**Test Loop (Phase 2):**
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- E2E/Integration failure → Create GitHub issue → Fix → Retest → Close issue
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- (MVP: Fix inline, no issue creation)
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---
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### Code Review Checklist
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Before merge:
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- ✅ **Style:** PSR-12 (PHP), Prettier (JS), ESLint (SvelteKit)
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- ✅ **Standards:** Laravel conventions, SvelteKit best practices
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- ✅ **Security:** Input validation, SQL injection prevention, XSS protection
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- ✅ **Tests:** All tests passing, coverage >70%
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- ✅ **API Docs:** Scribe auto-generated documentation up-to-date
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---
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### Commit Standards
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**Granular commits:** One fix = one commit
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**Format:**
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```
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[Type] Brief description (50 chars max)
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Detailed explanation (optional, 72 char wrap)
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Refs: openspec/changes/<change-name>
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```
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**Types:** `feat`, `fix`, `refactor`, `test`, `docs`, `chore`
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---
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## Timeline & Phases
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### MVP (Phase 1) - 6-8 Weeks
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**Sprint 1: Project Setup (1 week)**
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- Docker Compose setup (4 containers)
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- Laravel + SvelteKit scaffolding
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- Database schema design
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- JWT authentication
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**Sprint 2: Capacity Planning (1.5 weeks)**
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- Team member CRUD
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- Holiday/PTO calendar
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- Availability tracking
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- Capacity calculations
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**Sprint 3: Project Management (1.5 weeks)**
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- Project CRUD
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- Status state machine
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- Approved estimate tracking
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- Forecasted effort
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**Sprint 4: Resource Allocation (2 weeks)**
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- Allocation matrix UI
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- Validation rules (over/under detection)
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- Visual indicators (GREEN/YELLOW/RED)
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- Untracked resource bucket
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**Sprint 5: Actuals & Reporting (2 weeks)**
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- Time logging interface
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- Utilization calculations
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- 5 core reports with filters
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- Redis caching implementation
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**Sprint 6: Testing & Polish (1 week)**
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- E2E test coverage (Playwright)
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- Code review
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- Bug fixes
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- API documentation (Scribe)
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---
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### Phase 2 - Enhancements (3-4 weeks)
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**Deferred Features:**
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- Notifications (WebSocket) - ~6 hours
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- PDF/CSV exports - ~4 hours
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- Background jobs (Laravel Queue) - ~2 hours
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- Audit logging - ~3 hours
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- Advanced caching (pre-calculated reports) - ~4 hours
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- Issue-driven test loop - ~8 hours
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- Bug fixes from production use
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---
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### Phase 3 - Scale & Optimize (TBD)
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**Future Enhancements:**
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- Multi-tenancy
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- Mobile optimization
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- AI-powered forecasting
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- Integration APIs (time-tracking, accounting)
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- Advanced resource-level over/under forecasting
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---
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## Success Metrics
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### MVP Success Criteria
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**Functional Completeness:**
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- ✅ Users can define team capacity (members, holidays, PTO, availability)
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- ✅ Users can create projects with approved estimates
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- ✅ Users can allocate resources to projects month-by-month
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- ✅ Users can log actual hours worked
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- ✅ System validates allocations (over/under warnings)
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- ✅ Users can view 5 core reports (forecast, utilization, cost, allocation, variance)
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- ✅ RBAC enforced (4 personas: Superuser, Manager, Dev, Top Brass)
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**Quality Metrics:**
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- ✅ All tests passing (unit + E2E)
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- ✅ Code coverage >70%
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- ✅ Zero linting errors
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- ✅ API documentation auto-generated (SwaggerUI)
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- ✅ Docker Compose setup working (local dev)
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**Usability Metrics (Post-Launch):**
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- **Manager time savings:** Complete monthly allocation in <30 minutes (vs 2+ hours in spreadsheet)
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- **Billing accuracy:** Zero billing errors in first 3 months (over/under caught before invoicing)
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- **Adoption:** 90% of team members log actuals weekly
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---
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## Data Model (Simplified)
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### Core Entities
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**Team Member**
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- Name, Role, Hourly Rate, Active status
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**Project**
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- Project Code, Title, Status, Type, Approved Estimate, Forecasted Effort
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**Allocation**
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- Project + Team Member + Month + Allocated Hours
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**Actual**
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- Project + Team Member + Month + Hours Logged
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**Supporting Entities:**
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- Roles, Project Statuses, Project Types, Holidays, PTO
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### Key Relationships
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```
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TEAM_MEMBER ──< ALLOCATION >── PROJECT
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│ │
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└─< ACTUAL >────────────────┘
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│
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└─< PTO
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```
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---
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## Master Data / Taxonomy
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**Configurable Lists (Admin-managed):**
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**Roles/Teams:**
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- Frontend Developer
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- Backend Developer
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- QA Engineer
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- DevOps Engineer
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- UX Designer
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- Project Manager
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- Architect
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**Project Statuses:**
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- NA/Support, Initial, Gathering Estimates, Estimate Pending Approval, Estimate Rework, Estimate Approved, Funded, Scheduled, In-Progress, Ready for Prod, Done, On-Hold, Cancelled
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**Project Types:**
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- Project (billable)
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- Support (ongoing ops)
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**Availability Options:**
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- 0 (unavailable/PTO)
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- 0.5 (half day)
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- 1.0 (full day)
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---
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## Explicitly Out of Scope
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**Features NOT included:**
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- Time-tracking tool integration (manual entry only)
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- Mobile app (desktop web app only)
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- Invoicing integration (billing forecasts only, not actual invoicing)
|
||
- Project task management (project-level tracking only, not task-level)
|
||
- Calendar sync (Google, Outlook) - manual PTO/holiday entry
|
||
- AI-powered forecasting (rule-based validation sufficient for MVP)
|
||
|
||
---
|
||
|
||
## Key Design Decisions
|
||
|
||
### Decision Log Summary
|
||
|
||
| Decision | Rationale |
|
||
|----------|-----------|
|
||
| **SvelteKit (separate from Laravel)** | Clean separation, modern framework, worth the learning curve |
|
||
| **Redis caching from day 1** | Prevents refactoring debt ("No need to sweat on refactoring it everywhere") |
|
||
| **JWT authentication** | Token-based, future-ready for mobile |
|
||
| **PostgreSQL from day 1** | Avoid migration pain, production-grade |
|
||
| **Defer notifications (WebSocket)** | Not time-critical for monthly planning, saves 6 hours |
|
||
| **Defer PDF/CSV exports** | On-screen reports sufficient for MVP, adds 4 hours |
|
||
| **>70% code coverage** | Fair but not too lenient, enforced from day 1 |
|
||
| **Granular commits** | One fix = one commit, better git history |
|
||
| **Both over and under-forecast flagged** | "This money is my salary!" - 100% allocation is goal |
|
||
|
||
---
|
||
|
||
## Project Philosophy
|
||
|
||
### Guiding Principles
|
||
|
||
1. **Quality over speed** - >70% test coverage, code review, security checks from day 1
|
||
2. **Prevent technical debt** - Redis from day 1, containerization from start
|
||
3. **100% allocation is the goal** - Both over and under-forecast are problems
|
||
4. **Manager time is valuable** - Reduce monthly allocation time from 2+ hours to <30 minutes
|
||
5. **Billing accuracy is critical** - Zero tolerance for over/under-charging clients
|
||
6. **Defer, don't compromise** - Features deferred to Phase 2, not cut or half-implemented
|
||
|
||
---
|
||
|
||
## Contact & Ownership
|
||
|
||
**Project Owner:** Santhosh J
|
||
**Project Type:** Magnum Opus ("This is my magnum opus project as of date.")
|
||
**Intended Users:** Self + Associate
|
||
**Timeline:** MVP in 6-8 weeks, Phase 2 in 3-4 weeks
|
||
|
||
---
|
||
|
||
## Appendix: Technology Stack Summary
|
||
|
||
### Backend
|
||
- Laravel 12 (latest, PHP 8.4-FPM)
|
||
- PostgreSQL (latest)
|
||
- Redis (latest)
|
||
- JWT Authentication (tymon/jwt-auth)
|
||
- Laravel Scribe (SwaggerUI)
|
||
- PHPUnit + Pest (testing)
|
||
|
||
### Frontend
|
||
- SvelteKit
|
||
- Tailwind CSS + DaisyUI
|
||
- Recharts (charts)
|
||
- TanStack Table (data grids)
|
||
- Superforms + Zod (forms & validation)
|
||
- Vitest + Playwright (testing)
|
||
|
||
### Infrastructure
|
||
- Docker Compose (4 containers)
|
||
- Nginx Proxy Manager (reverse proxy)
|
||
- .env configuration
|
||
- Code-mounted volumes (hot reload)
|
||
|
||
---
|
||
|
||
**Document Version:** 1.0
|
||
**Last Updated:** February 17, 2026
|
||
**Status:** Approved for Development
|
||
|
||
---
|
||
|
||
*"Headroom - Know your capacity, prevent billing errors, deliver on time."*
|
||
|
||
---
|
||
|
||
**END OF EXECUTIVE SUMMARY**
|