Basic Ideas

Basic Idea of Unit Testing:

Each component is tested in isolation - only components that have been previously tested may be included.

Basic Idea of Levelized Design:

Each component depends only on components that are at a lower level - no feedback or circular designs.

Example:

Why is a Levelized Design desirable?

• Necessary for incremental compilation in F90 if dependency is via ``use association''
• Makes Unit Testing possible