This study evaluated the degree in which leadership training in the marketplace was effective at developing authentic leadership and at changing individual behaviour. Theories of change were integrated in the current study. A conceptual model combining Authentic Leadership Development (ALD) theory and the Theory of Planned Behaviour (TPB) was proposed. Furthermore, this study explored the relationship between a positive contemplation of change and the actual change observed in individuals after the leadership intervention. This longitudinal quasi-experimental study surveyed managers in one of...