This excerpt from “Essential SharePoint 2013: Practical Guidance for Meaningful Business Results” covers Chapter 2: Planning Your Solution Strategy. In the chapter, authors Scott Jamison, Susan Hanley and Chris Bortlik explain whether SharePoint is an application, a platform or a framework while laying out what’s new in SharePoint 2013. 
They also plot out a SharePoint Strategy Roadmap, going over business objectives, stakeholders and relevant capabilities.
Essential SharePoint 2013