And a good drawing program is hard to find!
By good I mean one that doesn’t get in the way. One that is intuitive and simple. One that can do shapes, lines, labels, and text wherever I need it, Arrows and other connectors with optional heads for drawing any kind of process or data flow or other diagram or application architecture or organization.
Diagrams are great ways to lay out how things work, or how they should work. To show the structure of a problem — and the structure of the solution. (Hint: they should map one to the other pretty clearly!)