Engineering and computer science reports
Consider following question from an Engineering design course
This assessment item is a formal design report that documents the systems engineering design process that you undertook for your project. The document should outline the thinking in the application of the design tools, not just the final design decisions. In particular, the optimality or goodness of the final design should be justified in the report through evidence provided by the Systems Engineering Design process that you have undertaken.
Note the wording "should be justified through evidence". This gives a clue to what you need to be focusing on when writing up your report and will help guide your analysis and research, the next step in the process.