BLUF (bottom line up front) - the practice of beginning a message with its key information

Military professionals use BLUF to send over-written messages, mostly emails. It declares the decision/question right away, and THEN explains the background and context that supports it.
The BLUF should quickly answer the five W’s: who, what, where, when, and why. An effective BLUF distills the most important information for the reader. (Sehgal, 2016)
That's because the reader doesn't necessarily want to know the whole context, but they NEED to know the decision/information.