You could try Joel Spolsky's Painless Functional Specifications series. The first article is https://www.joelonsoftware.com/2000/10/02/painless-functional-spec

You could try Joel Spolsky's Painless Functional Specifications series. The first article is https://www.joelonsoftware.com/2000/10/02/painless-functional-specifications-part-1-why-bother/ https://www.joelonsoftware.com/2000/10/02/painless-functiona.... Edited for formatting.