I would add: "It is natural for projects to appear to progress quickly at the beginning of the development cycle, since developers will seek out assignments that they understand. At some point there will be assignments that are more challenging, that are outside the primary expertise of the developers, or that take coordination with other teams. It is important for the long-term success of the project that developers not play games related to this, and specifically not to cherry-pick easier assignments to make themselves look good".