The Webster and Wind Model of organizational buying behavior is quite a comprehensive model. It considers four sets of variables which affect the buying-decision making process in a firm. These are environmental, organizational, buying center, and individual.
The organizational buying behavior process is well documented with many models depicting the various phases, the members involved, and the decisions made in each phase. The basic five phase model can be extended to eight; purchase initiation; evaluations criteria formation; information search; supplier definition for RFQ; evaluation of quotations; negotiations; suppliers choice; and choice implementation
Porter's diamond model suggests that there are inherent reasons why some nations, and industries within nations, are more competitive than others on a global scale. The argument is that the national home base of an organization provides organizations with specific factors, which will potentially create competitive advantages on a global scale.