| Sumario: | Researchers and practitioners are increasingly embracing systems approaches to deal with the complexity of public service delivery and policy evaluation. However, there is little agreement on what exactly constitutes a systems approach, conceptually or methodologically. We review and critically synthesize systems literature from the fields of health, education, and infrastructure. We argue that the common theoretical core of systems approaches is the idea that multi-dimensional complementarities between a policy and other aspects of the policy context are the first-order problem of policy design and evaluation. We distinguish between macro-systems approaches, which focus on the collective coherence of a set of policies or institutions, and micro-systems approaches, which focus on how a single policy interacts with the context in which it operates. We develop a typology of micro-systems approaches and discuss their relationship to standard impact evaluation methods as well as to work in external validity, implementation science, and complexity theory.
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