As previously stated, the core belief for our business proposal is that people change only when they have full view of the benefits for changing versus the cost of not changing, and a strong emotional trigger to commit for the change. In terms of change management process these are the first two stages: awareness and desire to be part of the change.
Have you seen the "Inception" movie? This core belief I recognised it in the Inception movie. Beyond the action scenes, in terms of personal change this movie is setting a standard, which I found it latter in psychology: a sustainable change is when one person is feeding it resources in an effortless approach.
In Leadership Coaching sustainable change will mean integrating a core competence in the system and growing this competence through own experiences and own perspectives.