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Many development challenges are complex, involving a lot of different agents and with unknown dimensions. Solutions to these challenges are often unknown, and contextually dependent. At the same time, there are political imperatives at play in many contexts which create pressure to 'find the solution now…and then scale it up.' Such pressure raises a question: how does a policy entrepreneur or reformer find a new solution and scale it up when dealing with complexity? This is the subject we address in the current paper, which is the fifth in a series on 'how to' do problem driven iterative adaptation (PDIA) (Andrews et al. 2015, 2016a, 2016b, 2016c).