This post is the third in my series on the characteristics of Every Page is Page One topics, which I introduced in Every Page is Page One Topics are Everywhere, and continued in topics on the properties standalone and specific limited purpose.
This series is not a attempt at designing something new; it is an investigation into the properties of the millions of page-one topics that already exist, and that are being created everyday. At this point a reader might fairly ask why such a study is necessary, and the simple answer is that while technical writers in large numbers have come to embrace topic-based writing in principle, many still struggle to create topics that really work, and in many cases they quickly retreat to some form of book-like heirarchy of information.