What to check. Check neighbouring land for possible displacement of damage.
Verified published formula · Difference-in-differences arithmetic

Method. Compare changes over the same observation window: (neighbour after − before) − (comparison after − before). A positive difference is a reason to investigate, not proof that the scheme caused clearing.
What this means. Neighbouring clearing increased by 0.8 ha; comparison-area clearing increased by 0.1 ha. The extra 0.7 ha is a signal to investigate, not proof of displacement caused by the agreement.
Next step. Investigate neighbouring clearing and possible causes.
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. Agreement and version; Who carries out the work; Who funds the agreement; New clearing in the neighbouring area before [ha]; New clearing in the neighbouring area after [ha]; New clearing in a separate comparison area before [ha]; New clearing in the comparison area after [ha]; Earlier observation; Later observation; Equal observation windows and fixed comparable areas documented; Map and field-check reference
Other required evidence. Project boundary; neighboring activities; baseline; follow-up; causal evidence.
Fictional worked example · 2025
Laggala Pallegama farmer group · Laggala Pallegama
| Input or result | Value | Unit |
|---|
| Agreement and version | Laggala Pallegama riverbank care / draft 1 | |
| Who carries out the work | Laggala Pallegama farmer group — example | |
| Who funds the agreement | Downstream water-user fund — example | |
| New clearing in the neighbouring area before | 0.6 | ha |
| New clearing in the neighbouring area after | 1.4 | ha |
| New clearing in a separate comparison area before | 0.4 | ha |
| New clearing in the comparison area after | 0.5 | ha |
| Earlier observation | 2024-06-30 | |
| Later observation | 2025-06-30 | |
| Equal observation windows and fixed comparable areas documented | Documented | |
| Map and field-check reference | Two fixed 200 ha observation areas; same clearing definition and season — example | |
| Difference between the two increases | 0.7 | ha |
|---|
| Increase in neighbouring clearing | 0.8 | ha |
|---|
| Increase in comparison-area clearing | 0.1 | ha |
|---|
Illustrative watershed-care agreement. Contract rules, rate, payer, monitoring and safeguards need confirmation in Institution review. Maintained hectares do not establish a measured water-quality improvement.
Proposed checking role. Scheme coordinator with the independent checker or relevant specialist.
After the action. Verified outcomes, costs, distributional effects and evidence strength.
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.
- UN SEEA Ecosystem Accounting — Institution publication. Full method locator not established. Institutional context; does not establish the calculation or local approval.
- FAO PES and food security — 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.