This information is considered classified and not for general release.
All information is taken from Pre-Yavin days.
The current reliability of such information is speculative. For security reasons, this document has been digested. Authorization from Sector Commanders is required for uncondensed versions. Selected troopers are sent to the various hidden Imperial clone labs where specific material is taken from them for the express purpose of cloning future Stormtroopers. Usually high intelligence, survivability, cunning, efficiency, and loyalty are qualities considered.