The emphasis on quality has evolved through four distinct stages since world war ii. listed chronologically, these stages are:

The four district stages which are in chronologic order and that evolved since the world war 2 and the place an emphasis on their quality are the following;

· Fix-it

· Inspect-it-in

· Build-it-in

· Design-in-it

These are the four district stages that have evolve since the world war 2