The following are the most popular business diagrams on our site:
CDSTEP Marketing Diagram 
Situational Leadership Diagram 
Customer Lifecycle 
DISC Model Dominance Influence Conscientiousness Steadiness 
5S Kaizen Framework 
GE McKinsey Nine Box Matrix - Motivation in the Workplace
Cost Of Poor Quality COPQ 
Cognitive Bias Codex 
Project Charter Example - Swot Analysis
Gap Analysis Current vs Future State 
BCG Matrix 
Business Heat Map 
Value Stream Map