Application development and delivery (AD&D) professionals are not usually the driving force behind creating the business case for mobile — but that doesn't mean they don't have a role to play. Business leaders define the expected business benefits and then look to developers and managers to determine the overall cost of these initiatives. To build a plan, AD&D pros must assess many factors and understand how they combine to deliver a cohesive mobile strategy. This report provides a comprehensive guide of the cost categories to consider in mobile initiatives. This is an update of a previously published report; Forrester reviews and updates it periodically for continued relevance and accuracy.