Officer-Enlisted Man Relationships is a 1946 Secretary of War’s Board report written by Robert P. Patterson.

Memorandum for the Assistant Secretary of Defense is a 1953 paper about how to attract and retain capable career personnel.

Summary Taxonomy of Select21 Army-wide Requirements for First Term Soldiers is 2002 paper listing important skills.

Future Army-wide Pre-enlistment KSAs is a list of important skills categorized by basic skills, ethic, and self-management.

A Select21 Memorandum for the Record: Preliminary Job Clusters is a 2002 HUMRRO paper about job clusters and training.

Select21 Draft Army Common Soldier Tasks is a list of Common Soldier Tasks Likely to be Retained in the Future.

Subject Matter Expert Panel Meeting #1 is a 2002 HumRRO slideshow about the development of critical KSAs and improved classifications.

Narrative Descriptions of Select21 Job Clusters is a 2002 paper going into detail about the clusters Close Combat and Electronics Maintenance.