[book] Produce a nice image showing the workflow

[yongrenjie]

Probably not super urgent / important, but it would be nice to have a diagram such as that on the SPC website:

https://alan-turing-institute.github.io/uatk-spc/

which summarises the project workflow (from indicators -> outputs).

[ciupava]

+1 from me, to be added in the book (see comment) and elsewhere

[martinfleis]

Who did that SPC diagram? It looks like some designer? I doubt I will be able to produce anything that nice. I can do a simple workflow diagram.