No one leadership style or decision making process fits all situations. By analyzing the situation and evaluating the problem based on time, team buy-in, and decision quality, a conclusion about which style best fits the situation can be made. This model defines a very logical approach to which style to adopt when trying to balance the benefits of participative management with the need to make decisions effectively.
This is a useful model in new situations, or in ones which have unusual characteristics. Using it, you'll quickly get an feel for the right approach to use in more usual circumstances.