Methodology
This page explains how work on the material is organised: where topics come from, what the conclusions rest on and where the limits of what is written lie.
How topics and data are chosen
A topic starts with a concrete question that has no short answer. The piece is built around verifiable figures rather than around general reasoning.
Limits of the approach
What is written here is not individual advice. A reader situation may differ from the one described, and only a specialist who knows the details can check that.
Updating the material
A published piece is revisited when the data it rests on changes. The date of such a review is shown on the page itself.
Material on this site is prepared and checked by Marcus Caldwell.