Most of the theories of consumer buying decision-making assume that the consumer's purchase decision process consists of several steps. However, it may vary from product to services but all the customers pass through similar process. This study will help the marketers to understand various steps in the whole process of consumer decision making for final purchase of the products of their choices. The marketers may improve their marketing strategies by understanding issues which are most common in the different consumer decision model developed by earlier researchers and scholars of marketing management. In the present study we have tried to identify the major cues for purchase decision making and we have also explained various buying decision model which are most valuable in marketing literature like consumer psychology (how consumers think, feel, reason, and select between different alternatives), the psychology of how the consumer is influenced by his or her environment, behavior while at shopping, consumer knowledge or information processing abilities etc. and we have focused as how marketer can improve methods to convince the customers effectively.