1-5. Development depends on having clear purpose for what, when and how to develop. Good leader development is purposeful and goal-oriented. A clearly established purpose enables leaders to guide, assess, and accomplish development. The principles of leader development describe goals for what leaders need to be developed to do: leading by example, developing subordinates, creating a positive environment for learning, exercising the art and science of mission command, adaptive performance, critical and creative thinking, and knowing subordinates and their families. The core leader competencies and attributes identified in ADRP 6-22 and the Army Leader Development Strategy (ALDS) provide additional detail of what leaders need to be able to do.