A section is a cut through the 3d-model. An elevation is different. It shows the face of something, or perhaps more correct, the projection of an object/s to a plane.
Project Definition: Establishing Scope, Vision and Work Effort. In order to have any realistic shot at a successful project, (delivered on time and on budget) the overall vision and work effort must first be fully defined --- i.e. broken down into small, manageable and actionable parts.
A project (usually a video game) that has taken so long to complete that one of two possibilities exist: either the project will never be completed, or in the even that the project is completed, it will be so crappy that it would've been better off never being completed.