Evaluate soil and water-management practice 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 Measured runoff before [mm/season]; Treatment Measured runoff after [mm/season]; Comparison Measured runoff before [mm/season]; Comparison Measured runoff after [mm/season]; Study design and comparability evidence; Outcome definition, method and reference basis
Other required evidence. Practice; baseline condition; follow-up; comparison blocks; rainfall; uncertainty.
Fictional worked example · 2025
Laggala Pallegama — soil and water · Laggala Pallegama
| Input or result | Value | Unit |
|---|
| Treatment Measured runoff before | 42 | mm/season |
| Treatment Measured runoff after | 59 | mm/season |
| Comparison Measured runoff before | 39 | mm/season |
| Comparison Measured runoff after | 46 | mm/season |
| Study design and comparability evidence | Missing | |
| Outcome definition, method and reference basis | Measured runoff /example matching definition1 | |
| Difference in changes | 10 | mm/season |
|---|
The arithmetic alone does not establish causation. Design, parallel trends, confounding, attrition, uncertainty and adverse effects need appropriate evidence.
Proposed checking role. Estate agronomist, operations lead and environmental/social 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.
- Tea Research Institute agronomy — Institution publication. Agronomy division: research and development activities and key research areas. Institutional context; does not establish the calculation or local approval.
- TRI climate adaptation guideline 2019 — Institution publication. TRI Guideline 01/2019, pages 1-2: impacts and adaptation strategies. 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.