This blog post has not the intend to define what a requirement/constraint is, there are already very good posts out there. Lately I pointed a lot of people over to Jeffrey Kusters who did an excellent job of summarizing it but I included also two other good links:
Disclaimer: I am by no means an expert on this topic nor have I got the feeling that my performance during the VCDX defense was exceptional. However, some basic training got me from “zero” to at least one step further - more or less readable handwriting.
On December 13th, 2018 I received an email: