Here is another one: “Good programs work. Bad ones don’t.” College orientation, 1964.
My first program, 1969, ran for 18 years without a change. Nobody understood it and they lost the documentation.
It solved 40 equations with 90 unknowns, had its own memory swapping routines, and used a relational database. None of those existed at that time. It wouldn’t run on newer machines near the end of its life. IBM reversed one property of a datatype. It also increased the company’s market share by 20 percent.
Finally, “All programs have bugs.”
That’s why your plans had better include this:
