Colophon
How this site is made, and how its numbers are handled.
A colophon is the note at the back of a book that says how it was set. This is that note for leed.dk, on how the site is built and how its numbers are handled. Where a number appears, the aim is to name its source and show its range when a published range exists.
How this site is made
The pages are plain HTML and CSS with vanilla JavaScript on top. There is no framework and no build step. The data files behind the charts and maps are generated by small Python scripts and shipped as plain files. A few small PHP files handle the two forms. The rest of the site is static files.
Each chart is drawn from scratch in canvas or SVG. The charts use no charting library, so the visual choices in a figure are all mine. The simulations in the Lab run in your browser. The site uses two third-party libraries, KaTeX to typeset the mathematics on the Lab page and Font Awesome for its icons.
The type is Playfair Display for headings and Inter for body text. Both are served from this domain. The one exception is the Lab, where the KaTeX maths library and its fonts load from a CDN.
The small gold and teal mark that divides these sections is the site's identity. It is an interval, a bar from the 10th to the 90th percentile with a tick at the median, because that is the shape I think an estimate should have. The favicon in your browser tab is the same mark redrawn in white and gold on navy.
The site runs Google Analytics, and only if you accept the consent banner. If you decline, the script never loads and nothing is sent. Details are in the privacy policy.
Measurement notes
The reference classes behind the Lab's tools come from the percentile tables published in Hubbard, Budzier & Leed (2025), How to Measure Anything in Project Management, Wiley. The tools start from those published tables, and any further assumption is stated on the tool itself.
The map shows banded ranks of ecological quality across Denmark and nothing more. It never shows prices, and no page on this site puts a money figure on any single parish or home.
Headline results from unpublished working papers are rounded on the summary pages, and statistical associations are not described as causal effects. The Go Deeper sections of the Lab tools report the estimates in more detail, with their uncertainty. Both the rounded results and the detailed estimates may change before the papers are published.
No figure on this site has been retracted so far. If one turns out to be wrong, the correction will be listed here with the date, the original figure and the corrected one.
If you spot an error on this site, in a number, a chart or a sentence, I want to know. Write to me through the contact page. Last updated September 2026.