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.
Project definition. Project execution. Before you can effectively manage a project, there needs to be a shared understanding of that project - its purpose, objectives, scope, sponsorship, funding and mandate. Some people would define the project as not existing until it has an adequate definition.