In order to provide a competitive advantage to the enterprise, the business strategy and processes and its information system (IS) need to be aligned. Achieving strategic alignment continues to be a major concern for business executives and becomes more difficult to handle in an evolving environment. The literature provides conceptual frameworks dividing a company representation in independent and exchanging layers and aiming at the strategic alignment. In this paper, we describe eight among these works. Aiming a better understanding of the Business/IS alignment requirements, we propose an analysis framework, in which we position the studied approaches, and we bring out the most important results related to the forces and weaknesses of these approaches.