Collins - Five-Tier Leadership Hierarchy
Slowing down and developing a plan is better than tackling fires.
Proof: Women Over 55 Best Suited For Strategic Leadership - Forbes
Growing Your Business: Strategic Leadership Skills for the Long Game
Pyramid with 5 levels: 1 (bottom) Highly Capable Individual, 2 Contributing Team Member, 3 Competent Manager, 4 Effective Leader, and 5 (top) Level 5 Executive.