An impact map puts all the deliverables in the context of the impacts that they are supposed to support. This helps with breaking deliverables down into independent chunks that provide clear business value, and helps us launch something valuable sooner. A clear hierarchy allows us to group related deliverables, compare them and avoid over-investing in less important actors or impacts. It also helps us to throw out deliverables that do not really contribute to any important impact for a particular goal. Finally, by connecting deliverables to impacts and goals, a map shows the chain of reasoning
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