No matter what the scientific field, lab reports all have similar elements. One such attribute is the inclusion of a discussion or conclusion section. Many feel intimidated when composing this section because it requires the most critical thinking. The main purpose of the conclusion and discussion section is to comment on the results mentioned in the lab report. 1. Use elements from the introduction in the conclusion. Their structure must be similar. If you are having difficulty writing the conclusion, re-read the introduction for ideas about what to write.