1.1. The introduction of the report identifies the subject, the purpose (or objective), and the plan of development of the report. The subject is the "what", the purpose is the "why", and the plan is the "how." Together these acquaint the reader with the problem you are setting out to solve.

1.2. State the subject and purpose as clearly and concisely as possible, usually in one sentence called the thesis or purpose statement:

This report describes the design of a full-scale prototype shrimp trawl that would permit a test of the commercial feasibility of electric trawling during daylight.

1.3. Use the introduction to provide the reader with any background information which the reader will need before you can launch into the body of your report.  Avoid the tendency to use the introduction merely to fill space with sweeping statements that are unrelated to the specific purpose of your report ("Throughout the ages, human beings have looked up at the stars and wondered about [your topic here].").

2. Discussion

2.1. This section is the most important part of your report. Its basic components are methods, findings (or results), and evaluation (or analysis).  The report should emphasize evaluation of the speaker and his(her) topic. Most academic assignments should also focus on your evaluation of the subject.
2.2. Before you begin writing, ask the journalist's questions: who? when? where? what? why? how? The last three in particular will help you focus analysis.

3. Conclusion
What knowledge comes out of the report? As you draw a conclusion, you need to explain it in terms of the preceding discussion. Some repetition of the most important ideas you presented there is expected, but you should avoid copying.