Evaluate whether programmes produced sustained community benefits.
Inputs, example and sources
World Bank · Impact Evaluation in Practice Second Edition
Institution publication · Chapter 7, table 7.2, printed page 140, PDF page 170
The formula is verified. Causal interpretation still requires a defensible study design, comparison and assumptions.
Keep the same place, observation period, definitions, units and source versions.
Analysis inputs. Treatment Consistently measured livelihood outcome before [LKR/household]; Treatment Consistently measured livelihood outcome after [LKR/household]; Comparison Consistently measured livelihood outcome before [LKR/household]; Comparison Consistently measured livelihood outcome after [LKR/household]; Study design and comparability evidence; Outcome definition, method and reference basis
Other required evidence. Baseline; follow-up; comparison; costs; unintended effects; community feedback.
Fictional worked example · 2025
Laggala Pallegama — outcome evaluation · Laggala Pallegama
| Input or result | Value | Unit |
|---|
| Treatment Consistently measured livelihood outcome before | 420,000 | LKR/household |
| Treatment Consistently measured livelihood outcome after | 590,000 | LKR/household |
| Comparison Consistently measured livelihood outcome before | 390,000 | LKR/household |
| Comparison Consistently measured livelihood outcome after | 460,000 | LKR/household |
| Study design and comparability evidence | Missing | |
| Outcome definition, method and reference basis | Consistently measured livelihood outcome /example matching definition1 | |
| Difference in changes | 100,000 | LKR/household |
|---|
The arithmetic alone does not establish causation. Design, parallel trends, confounding, attrition, uncertainty and adverse effects need appropriate evidence.
Proposed checking role. Community programme lead, participant representatives and safeguarding reviewer.
After the action. Verified outcomes, costs, distributional effects and evidence strength.
- World Bank Impact Evaluation in Practice Second Edition — Institution publication. Chapter7 difference-in-differences. Published difference-in-differences estimator and study assumptions; aggregate examples do not establish causation.
- SHARED domain decision contracts — Validation required. Domain decision rules and matching fictional examples. Local comparisons, constraints, source matching, sorting and follow-up proposals; developer checks do not establish scientific or client approval.
Institution and data context
- GCF FP124 project and documents — Institution publication. Full method locator not established. Institutional context; does not establish the calculation or local approval.
- IFRC community engagement and accountability — Institution publication. Community Engagement and Accountability: participation and trusted feedback mechanisms. Institutional context; does not establish the calculation or local approval.
- WHO water safety planning — Institution publication. Full method locator not established. Institutional context; does not establish the calculation or local approval.
Confirm local scope, data rights, parameters and responsible roles in this Institution review. Published components retain their source; they do not approve the local application.