Guidelines for identifying and designing planned comparisons

Planned comparisons help us to assess the relative effectiveness (possibly including cost-effectiveness) of options in addressing development challenges. Often, the suitability of options will vary by context, so different options suit different people and places. Planned comparisons help us to compare different options, so that we can better understand what works where and for whom. They provide us with evidence to guide investment decisions and to target interventions to where they are most likely to be effective. They can also generate more basic understanding to support the further design or modification of those options being considered, and—at the same time—contribute scientifically sound knowledge to the global knowledge base.

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