Methodological Briefs Modelling: Methodological Briefs - Impact Evaluation No. 13 AUTHOR(S) Howard White; Shagun Sabarwal Published: 2014 Methodological Briefs Modelling is an approach to impact evaluation which uses mathematical models to describe social and economic relationships and to infer causality from an intervention to an outcome, and/or between an outcome and its determinants. Models with more than one equation are most valuable, as they allow for both direct and indirect effects and also two-way relationships to be captured. Models can be used to examine the impact of a programme or policy by introducing them as an exogenous change in some of the variables, parameters or equations. + - Cite this publication | No. of pages: 11 | Thematic area: Ethical research, Knowledge management | Tags: evaluation, mathematical models, models, research methods × COPY BIBLIOGRAPHIC CITATION Howard White; Shagun Sabarwal 2014 Modelling: Methodological Briefs - Impact Evaluation No. 13. , pp. 11.