Assess whether completed interventions improved local outcomes.
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 Verified local outcome indicator before [specified outcome unit]; Treatment Verified local outcome indicator after [specified outcome unit]; Comparison Verified local outcome indicator before [specified outcome unit]; Comparison Verified local outcome indicator after [specified outcome unit]; Study design and comparability evidence; Outcome definition, method and reference basis
Other required evidence. Baseline; follow-up; intervention dates; comparison sites; weather; community feedback.
Fictional worked example · 2025
Laggala Pallegama — local outcomes · Laggala Pallegama
| Input or result | Value | Unit |
|---|
| Treatment Verified local outcome indicator before | 42 | specified outcome unit |
| Treatment Verified local outcome indicator after | 59 | specified outcome unit |
| Comparison Verified local outcome indicator before | 39 | specified outcome unit |
| Comparison Verified local outcome indicator after | 46 | specified outcome unit |
| Study design and comparability evidence | Missing | |
| Outcome definition, method and reference basis | Verified local outcome indicator /example matching definition1 | |
| Difference in changes | 10 | specified outcome unit |
|---|
The arithmetic alone does not establish causation. Design, parallel trends, confounding, attrition, uncertainty and adverse effects need appropriate evidence.
Proposed checking role. Delivery-team technical lead and community/safeguards 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.
- OECD evaluation criteria — Institution publication. Understanding the six criteria: definitions and elements for analysis. 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.