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The purpose of this chapter is to discuss theory-based evaluation of public–private partnership (PPP) projects/programmes and to develop an intervention logical framework. It aims to draw attention to the need to go beyond the measurement of project/programme results to address not only the question of whether or not the project/programme worked but also the how and why questions. The study follows an interpretative methodology. It analytically discloses the mechanics of theory-based evaluation in relation to a ‘PPP theory’ and describes a theory-based analytical framework that portrays an explicit path towards ultimate impacts so as to assess, in a more systematic and integrated way, the success or failure of a PPP. Theory-based evaluation is a promising evaluation approach that would fit into the complexities of PPP projects/programmes and would expand the available toolbox of evaluators. Proper use of theory-based evaluation in PPP interventions contributes to better policy formulation and project implementation, thus leading to improved socio-economic benefits derived from PPP projects and programmes. The main contribution of the study is that it develops a ‘PPP theory’ and a related logical intervention framework drawing on theory-based approaches. Although the framework is developed for a representative sector, transport, it can easily be applied to any other PPP intervention.