This Handbook is about how a career-change application is actually read — by a machine first, then by a person in a few seconds. Every number it turns on is traced here, with the strong ground marked as strong and the moving ground marked as moving.
The parent page names the load-bearing sources in a paragraph. This is the full list — graded honestly, with what is still settling named as such.
29 November 2026 — six months from launch. We re-verify every claim above, swap in newer or stronger studies where they have landed, and publish the updated edition. LinkedIn counts are reviewed quarterly in between.
If a study here has been superseded or retracted, or a claim reads stronger than its source supports, tell us: hello@thehandbookco.com. We read every correction, we reply, and where it is material the next edition reflects it — with the change named on the record.
Every claim sourced. Every number traced. The strong ground marked as strong, the moving ground marked as moving.— Jon, Publisher