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Developing useful theories of change (ToCs) for anintervention, especially complex interventions, is not straightforward nor something done in a couple of hourswith limited effort. Agreement is needed on a number of basic concepts and terms, key challenges need to be addressed, and there are numerous issues that need to be considered.Butthe effort is worth the investment of resources and time.Theory-based evaluation approaches need good ToCs.Some of the ideas here are discussed in the context of agricultural research for nutrition and health interventions by Mayne and Johnson (2015) (10) Developing and Using Useful ToCs. Available from: https://www.researchgate.net/publication/323868372_Developing_and_Using_Useful_ToCs [accessed Jun 13 2018].