in The Core Qualities of the Enneagram, Daniel Ofman and Rita van der Weck couple two dynamic developmet models with each other, the core quadrant and the ennea... » 

in The Core Qualities of the Enneagram, Daniel Ofman and Rita van der Weck couple two dynamic developmet models with each other, the core quadrant and the enneagram. The enneagram is a model which describes nine personality types and their mutual interactions. This centuries-old model has its origin, according to what has been handed down to us, in the Middle East. Each of the nine types follows its own strategy leading to success, but also brings with it hindrances. The types differ in core qualities, in what they strive for, in where they foces their attention, in what they avoid and in what they want to develop in themselves. The power of the enneagram lies in growing slef-insight and insight into the characters of people and organisations. The core quadrant provides insight into the connection between someone's core quality, pitfall, challenge and energy. What is primarily the aim here is to find the balance between core quality and challenge. The value of the core quadrant lies in discovering the connection between our strength and our weakness, how 'good' and 'bad' are extensions one of the other. In this the age-old principle of yin-yang thought is to be found again. «