The greatest strength of Kotter's model is its first two steps - creating a sense of urgency and creating the guiding coalition. Far too many leaders lurch into a programme of organisational upheaval without having properly convinced people first that there is a genuine need for change. Often leaders think they can drive change by the force of their own personality, rather than genuinely engaging a broader group of people who also understand the need for change. Individuals seldom have all the skills and insights needed to bring about successful organisational change. That's why a change leadership group - a guiding coalition as Kotter puts it - is so useful.