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Overall project management is a large part of the design development process. Much of the time, managing design is a process of managing change. Projects often develop as moving targets; communicating the program results in needing to answer questions that no one anticipated.
So the more the program develops, the more change management is required—sometimes in an exponential fashion. And although managing this kind of change becomes practically untenable in CAD, Revit allows you to manage multiple, simultaneous relationships faster than in any other application.
Groups and phasing is all about quickly and easily managing change in your project. Modifying one family component will update throughout a project. But groups can contain multiple host and family components. Phasing applies to views (filtered to show only a slice of a project's timeline) as well as geometry.