'Carol Weiss (1995) has defined a theory of change in a very simple way: a theory of change explains how and why an initiative works. Based on this definition, other authors (such as Fulbright-Anderson et al, 1998) have presented the theory of change approach as a systematic and cumulative study of the links between activities, outcomes, and contexts of a project or programme. In this case, it will be considered as the analytical representation of the full chain of causes and effects linking strategic decisions with specific social benefits.' (Source: IPEC, 'Developing and Using Strategic Programme Impact Framework')

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