As a developer I really liked these posts @pacharanero did on Child Health https://www.openhealthhub.org/c/centiles It helped me understand what is wanted, how it used, what issues are, etc.
Similarly @ian work on openEHR archetypes is really useful, it helps me understand what data is wanted, which codes I should use.
Hopefully I’ve just backed up Ian’s comments with a developer perspective…