1. We know the outcomes for participants on a training programme. But what was the counterfactual?
2. Given the counter-factual, we can estimate the programme's impact. But how certain are we?
3. Given that the evaluation has been done, how can we get the most value from it? How can we generalize what we learn from this evaluation to other training programs? How should we synthesize the lessons learned from multiple studies of different training programs?

PEPA research programme aims to:
(i) advance our understanding of the value of randomised control trials in social science;
(ii) improve inference for policy evaluation;
(iii) develop the key relationships between alternative methods for policy evaluation;
(iv) understand how best to combine quasi-experimental methods with dynamic behavioural models; and
(v) determine how to measure social networks and then use such data for programme evaluation.