That really depends on the audience. On this topic there are broadly-speaking two types of people: those who want the conclusion first and the details later ("

That really depends on the audience. On this topic there are broadly-speaking two types of people: those who want the conclusion first and the details later ("managers", if you will), and those who want the details first and the conclusion later ("investigators", perhaps). Knowing which class your audience falls into is incredibly valuable. I've seen this described as a pyramid. The first group wants to see the precipice first and work their way down to the foundation. The second group doesn't want to look at any stone before understanding what it's resting on.