What are the most common steps to creat software?

Answer 1

Requirements definition, design, programming, testing, production, product support.

The first 4 steps are often done iteratively.

Answer 2

Yea right. The next question will be, "What is SUMMIT-D"?

If this is a windows tool you have to start with the presentation, the way the tool looks and operates to the user. This is paramount because good ergonomics means success or failure.

You already know what the code is going to do. Design the form, plan what controls work best, what to do about menus and saving variables to the registry, where the controls should go, the layout.

Then write the code for the events and supporting subroutines.