How do we use it?

Think of something that does not work efficiently, then think of some improvements on it, prepare two columns (the defects column and the improvements column), then fill these two columns.

Why its important?

Not everything needs improvement, some things are perfect as they are. But there are certain things that need a lot of improvements. When you use this key, it encourages you to strive for continuous improvement in the different things you see around you.