Self-Leadership and Transformational Leadership
Transformational leadership is the most studied leadership style in organizational psychology, built around Bass's Four I's: Idealized Influence, Inspirational Motivation, Intellectual Stimulation, and Individualized Consideration. It is also a model that fails constantly in practice, in ways the research explains but most training never addresses.
In 2012, Andressen, Konradt, and Neck used structural equation modeling to ask whether self-leadership sits alongside transformational leadership as a separate input, or explains why it works at all. They found self-leadership serves as a mediator between transformational leadership and employee motivation. The Four I's are not techniques a leader applies. They are downstream expressions of a leader's relationship with themselves.
You cannot train the Four I's of Transformational Leadership and expect them to stick, because they are not techniques. They are downstream expressions of a leader's relationship with themselves.
Read the full breakdown, including why newer leadership models keep circling back to the same root, in Self-Leadership and Transformational Leadership: Why One Doesn't Work Without the Other.