Implementing VisiCalc
Bob Frankston, co-author of VisiCalc for the Apple II recalls the development process.

From the page:
"This is my long-delayed attempt at writing about my experience in writing VisiCalc and the many design decisions that we made along the way. But even after nearly a quarter century I remember many of the details though maybe my memories have evolved. The process of writing down this experience is already evoking many memories and, unless proven otherwise, I'll assume that they are memories of real events but others may view it differently and I will try to correct the more creative aspects of my memory."

Implementing VisiCalc