Hypotheses about factors or risks which could affect the progress or success of an intervention. Assumptions can also be understood as hypothesized conditions that bear on the validity of the evaluation itself, e.g., about the characteristics of the population when designing a sampling procedure for a survey. Assumptions are made explicit in theory based evaluations where evaluation tracks systematically the anticipated results chain.
Development Assistance Committee. (2002). Glossary of key terms in evaluation and results-based management. Paris, France: OECD.