very carefully 
but seriously, it's like this:
Executive Summary
(usually the last thing you write... it is a summary of everything
in the report... limit it to 3/4 to at most, 1 page)
Aim
(what the report is trying to find out, or what it is for)
Methodology
(how you went about doing it)
Results
(the results of the research in methodology)
Analysis
(analysis of the results)
Conclusion
(what you will do with the results and what the conclusion of all
the research and whatever you started)
after all that, you write the exec summary...
