The first part of this type of case study gives the (historical) background leading up to the project, and then the identification of the need
Defining the need
Usually a single sentence which clearly formulates the raison d’être for the project
Planning & construction
This is the longest section and covers the whole of the period between the original conception and its completion. It describes the steps such as location, delays, problems (and how they were overcome).
This section looks back on how the project has functioned since it was finished, detailing the good and bad points.