Analysing social impacts
Social impact analysis examines how project activities may change people's lives, how those changes are distributed and what measures can improve the outcome. The analysis should connect a specific activity to an affected person or group through a plausible, evidenced pathway. This gives the baseline a purpose and makes the resulting management commitments easier to verify.
Baseline research, consultation, design and impact analysis develop iteratively. IFC's historical 2003 good practice note discusses baseline collection before detailed impact analysis, while also describing repeated community review and feedback into project design. Its sequencing is useful for organising work; emerging findings can require further baseline investigation throughout the assessment. IFC, Addressing the Social Dimensions of Private Sector Projects, pages 4–9 and 14.
Trace each impact
For each relevant project phase, describe the activity, resulting change, affected population and consequence. For example, a construction closure may lengthen the route to fishing grounds, increase travel costs and reduce the time available for fishing. Establish who uses the route, seasonal variations, alternative access and the household importance of that activity.
Assess a credible future without the project alongside the proposed alternatives. This allows for existing trends, other developments and environmental variability. State whether the evidence comes from observation, a comparable project, consultation, a model or professional judgement. Record assumptions that would materially alter the conclusion.
This site's earlier household and community resources framework remains a useful organiser. The eight categories below are a practical checklist developed for these discussions; their use should be adapted to the project and affected population.
| Resource category | Questions for analysis |
|---|---|
| Human resources | How could health, skills, labour availability or care responsibilities change? |
| Social resources | What happens to support networks, institutions, participation and personal security? |
| Cultural and religious resources | How might access to important places, practices or collective identity change? |
| Environmental quality | Who experiences changes in air, water, soil, noise or other exposure? |
| Natural resources | How could access to land, forests, freshwater, fisheries or ecosystem services change? |
| Livelihood resources | What happens to production, employment, enterprises, costs and seasonal income? |
| Housing resources | How could occupancy, tenure, affordability, safety or residential access change? |
| Basic services | How might water, sanitation, education, healthcare or transport access change? |
A single pathway may span several categories. Retain the links between them when reporting consequences and aggregating estimates. Household averages also require interpretation: assess differences in access, control over resources and responsibilities within households, as well as between them.
Assess significance transparently
Define the criteria before assigning ratings. Relevant considerations include magnitude, duration, frequency, reversibility, affected people's circumstances and the importance of the resource or relationship. Explain the evidence supporting each judgement and record disagreement or uncertainty. IAIA's guidance treats significance assessment as a reasoned prioritisation process and includes affected people's perspectives. Vanclay and colleagues, 2015, task 13.
Use numerical scores where they aid a decision, with explicit definitions and thresholds. An ordinal rating needs an explanation of its meaning. Where a forecast is sensitive to uncertain assumptions, present a range or scenarios and identify what additional evidence would change the response.
Consider interacting pressures on shared resources and services. A project may contribute to an existing housing shortage, for example, while other investments and migration also affect demand. Assess the combined condition and the project's contribution, then identify responsibilities and opportunities for coordinated action. IFC's cumulative impact handbook.
Connect findings to action
For each material impact, record design avoidance options, mitigation, implementation responsibility, budget, timing and a verification measure. Assess the expected remaining impact with the measures in place and the consequences if implementation is delayed or ineffective. Track proposed measures, completed actions and observed outcomes as separate states.
The impact register should remain usable by engineering, land, procurement, community relations and monitoring teams. Link each finding to its supporting evidence and revision history. Further detail is available in baseline design, sampling and quantitative analysis, proactive planning and the methods references.