I use software called "autosketch" - like a mini version of AutoCad - to draw the illustrations for instructions. Because I am most familiar with it and I like the way I can organize each page in cells and the pages in worksheets, I copy the autosketch elements as Metafiles and then paste them into MS Excel.
In one file, I can have worksheets/pages for the Class Flyer/Supply List, Cover Sheet for the pattern, the cutting instructions, the assembly instructions, pictures of finished quilts, and personal notes for teaching.
I use Excel for just about everything. :wink: