Lead with the answer.
Busy readers decide in the first paragraph whether to read on. Structure the report so the answer comes first.
The answer
Layer 01
The conclusion or recommendation, in one or two sentences.
WHERE IT GOES
Page one, line one.
The reasons
Layer 02
Three points that support it. No more.
WHERE IT GOES
Right under the answer.
The evidence
Layer 03
The data and sources behind each reason.
WHERE IT GOES
The body.
The detail
Layer 04
Methods, full tables, everything else.
WHERE IT GOES
The appendix.
Answer first. Evidence after. Detail last.