Preparation - Knowledge for learning. Deep skill growth.
Reference - Knowledge for work. On-demand reference.
Supply - Knowledge for coordination. External individuals, teams, organizations.
System - Versatile knowledge.
Tools - Interactive enhancers.
Meta - Theory of knowledge.
Every mouse-click, mouse-movement, and key-press incurs a time-cost of action.
Every symbol, syllable, and whitespace incurs a time-cost of observation.