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evm-calculator

Productivity
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Automated calculation of all earned value metrics and forecasts

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How to use this skill

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Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/domains/business/project-management/skills/evm-calculator/SKILL.md

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EVM Calculator

Overview

The EVM Calculator skill provides comprehensive automated calculation of all Earned Value Management metrics, indices, and forecasts. It supports PMI PMBOK and ANSI/EIA-748 compliant calculations for project cost and schedule performance measurement and forecasting.

Capabilities

Core EVM Metrics

  • Calculate Planned Value (PV/BCWS)
  • Calculate Earned Value (EV/BCWP)
  • Calculate Actual Cost (AC/ACWP)
  • Calculate Schedule Variance (SV) and Cost Variance (CV)
  • Calculate SV% and CV% for normalized comparison

Performance Indices

  • Calculate Schedule Performance Index (SPI)
  • Calculate Cost Performance Index (CPI)
  • Calculate Critical Ratio (CR = SPI x CPI)
  • Calculate TCPI (To-Complete Performance Index)
  • Support both BAC-based and EAC-based TCPI

Forecasting

  • Calculate EAC using multiple methods:
    • EAC = BAC / CPI (typical performance)
    • EAC = AC + (BAC - EV) (atypical performance)
    • EAC = AC + [(BAC - EV) / (SPI x CPI)] (combined)
    • EAC = Bottom-up re-estimate
  • Calculate ETC (Estimate to Complete)
  • Calculate VAC (Variance at Completion)

Visualization and Trending

  • Generate S-curve visualizations
  • Perform trend analysis on indices
  • Create performance dashboards
  • Generate variance analysis reports
  • Produce management reserve tracking

Usage

Input Requirements

  • Budget baseline (time-phased BAC)
  • Progress data (percent complete or physical measurement)
  • Actual cost data by period
  • Work Breakdown Structure alignment
  • Optional: Management reserve allocation

Output Deliverables

  • Complete EVM metrics table
  • Performance indices with trends
  • Forecasts (EAC, ETC, VAC)
  • S-curve visualization
  • Variance analysis narrative

Example Use Cases

  1. Monthly Reporting: Calculate all EVM metrics for status reports
  2. Forecasting: Generate EAC using appropriate method
  3. Trend Analysis: Track SPI/CPI trends over time
  4. Corrective Action: Identify and analyze variances

Process Integration

This skill integrates with the following processes:

  • earned-value-management.js
  • budget-development.js
  • portfolio-prioritization.js
  • Status Reporting and Communication Management

Dependencies

  • Financial calculation libraries
  • Time series analysis utilities
  • Visualization libraries
  • Data aggregation algorithms

Related Skills

  • SK-001: Gantt Chart Generator
  • SK-009: NPV/IRR Calculator
  • SK-011: Benefits Tracking Dashboard