How should a report be written effectively?

Accountability is one of the best traits in company. Accountability entails keeping track of, evaluating, and, most importantly, taking ownership of task completion. You need to be able to describe what occurred, why it occurred, and how the outcomes relate to your mission. People in the business world have created a variety of tools, such as spreadsheets and report formats, to facilitate business-related thinking and conversation.

I believe a report that is well written and effective should be all emcompassing you just need to state all your observations and give your suggestions at the same time

A report should start with a brief introduction to the background of the report and a summary of the entire report before you go into details.