Sallah thought to himself that His antics were a stupidity in nature and unnecessary of power he held, and for sure were not  way to win her love and respect.
His antics were a foolish waste of power, Sallah thought, and certainly not the way to her heart and esteem.
- define system properties and constraints e.g. reliability, usability, response time etc. - can be product (e.g. performance), organisational (e.g. authentication) or external (e.g. legal)