[ Argument ]
I see the word argument and often first think quarrel or disagreement. It’s unfortunate, because an argument is also a ‘thing’, as in the reasoning given for (or against) something under discussion. A good argument, as a thing not the action of, allows us to compare evidence, seek proof, and continue the process of reasoning and discussing.
A well-written report should pose a solid and clear argument, without being argumentative. The argument might start with a conclusion and explain how the author got there, or, it might start with examples and reasons, building to a conclusion. Either structure argues well.