Group decision making is increasingly important for the successful completion of software development projects. Group oriented development approaches such as agile methods, which emphasize a sense-and-respond approach are becoming an integral part of software development. These methods are being used by an increasing number of organizations as a means of improving the agility and quality of the development process, and within these processes groups are increasingly involved in critical decision making. Groups are required to make regular group decisions and group members work closely with each other to develop software in time-boxed iterations. However, the literature lacks a clear understanding about how varying degrees of time pressure affects the decision outcomes of the development groups. As group cohesion is viewed as the most fundamental issue facing group decision-making processes, in this research-in-progress paper we develop a research instrument to measure the impact of time pressure and group cohesion on decision-making outcomes.