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pra-earned-value

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업데이트2026년 7월 12일 03:12

Measure project cost/schedule performance and forecast final outcomes with Earned Value Management using the PRA package. Use when a user provides a budget (BAC), a planned schedule curve, and actual costs/progress and wants SPI, CPI, variances, or an Estimate at Completion (EAC).

설치

Codex 또는 Claude로 설치 이 Prompt를 복사해 Codex, Claude 또는 다른 어시스턴트에 붙여 넣으면 Skill 페이지를 검토하고 설치를 진행할 수 있습니다.

Manus에서 실행

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paulgovan

paulgovan/PRA

GitHub 저장소 열기 Creator 저장소 보기

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Manus에서 실행

When to use

The user has a Budget at Completion, a cumulative planned-value curve, current progress, and actual costs, and wants performance indices or forecasts.

MCP tool

evm_analysis_tool(bac, schedule_json, time_period, actual_per_complete, actual_costs_json, cumulative) runs the complete ANSI/EIA-748 suite in one call — do not chain the individual metrics manually.

bac: Budget at Completion (total planned budget).
schedule_json: JSON array of cumulative planned completion fractions, e.g. [0.1, 0.2, 0.4, 0.7, 1.0].
time_period: current period (1-based index into the schedule).
actual_per_complete: actual percent complete as a decimal (e.g. 0.35).
actual_costs_json: JSON array of actual costs per period, e.g. [10000, 22000, 37000].
cumulative: "true" if the costs are already cumulative, else "false".

What it returns

Baseline: PV = BAC × planned%, EV = BAC × actual%, AC.
Variances: SV = EV − PV (schedule), CV = EV − AC (cost).
Indices: SPI = EV / PV, CPI = EV / AC (>1 is favorable).
Forecasts (EAC):
- Typical (CPI-based): BAC / CPI — current trend continues.
- Atypical: AC + (BAC − EV) — current variance is a one-off.
- Combined: AC + (BAC − EV) / (CPI × SPI) — schedule pressure affects cost.
ETC = EAC − AC, VAC = BAC − EAC, TCPI = efficiency required on remaining work to hit the target.

Warning thresholds

CPI or SPI below ~0.9 signals a project in trouble.
CPI rarely improves by more than ~10% after a project is 20% complete.
TCPI substantially above 1.0 is an unrealistic recovery target.

References

ANSI/EIA-748 Earned Value Management Systems standard.
DOE EVMS Interpretation Handbook (EVMSIH v2.0).

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Route a project risk analysis request to the right PRA tool. Use this as the entry point whenever a user asks about project cost/schedule uncertainty, earned value, risk probabilities, learning curves, or task dependencies and you are unsure which PRA capability applies. Points to the method-specific skills and the underlying MCP tools served by pra_mcp_server().

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name	pra-earned-value
description	Measure project cost/schedule performance and forecast final outcomes with Earned Value Management using the PRA package. Use when a user provides a budget (BAC), a planned schedule curve, and actual costs/progress and wants SPI, CPI, variances, or an Estimate at Completion (EAC).

When to use

The user has a Budget at Completion, a cumulative planned-value curve, current progress, and actual costs, and wants performance indices or forecasts.

MCP tool

bac: Budget at Completion (total planned budget).
schedule_json: JSON array of cumulative planned completion fractions, e.g. [0.1, 0.2, 0.4, 0.7, 1.0].
time_period: current period (1-based index into the schedule).
actual_per_complete: actual percent complete as a decimal (e.g. 0.35).
actual_costs_json: JSON array of actual costs per period, e.g. [10000, 22000, 37000].
cumulative: "true" if the costs are already cumulative, else "false".

What it returns

Baseline: PV = BAC × planned%, EV = BAC × actual%, AC.
Variances: SV = EV − PV (schedule), CV = EV − AC (cost).
Indices: SPI = EV / PV, CPI = EV / AC (>1 is favorable).
Forecasts (EAC):
- Typical (CPI-based): BAC / CPI — current trend continues.
- Atypical: AC + (BAC − EV) — current variance is a one-off.
- Combined: AC + (BAC − EV) / (CPI × SPI) — schedule pressure affects cost.
ETC = EAC − AC, VAC = BAC − EAC, TCPI = efficiency required on remaining work to hit the target.

Warning thresholds

CPI or SPI below ~0.9 signals a project in trouble.
CPI rarely improves by more than ~10% after a project is 20% complete.
TCPI substantially above 1.0 is an unrealistic recovery target.

References

ANSI/EIA-748 Earned Value Management Systems standard.
DOE EVMS Interpretation Handbook (EVMSIH v2.0).