Digital business leaders must define and then execute digital banking strategy. To do this, they must craft an action plan that sets out the guiding principles of the bank's digital strategy and the building blocks of digital initiatives: culture, organization, technology, and insights. One crucial commonality across these building blocks is iteration: the means by which leading banks successfully execute their digital strategies. This report outlines how digital banking leaders should create an action plan that helps them win in the age of the customer. This report was originally published in December 2016; Forrester reviews and updates it periodically for continued relevance and accuracy, most recently in December 2017.