The emergence and widespread adoption of agile methodologies is of- ten explained by the need to improve time management in Information Systems Development (ISD). Indeed, a growing body of evidence supports the view that agile methodologies are an effective means of delivering productivity gains through time savings. That is to say, agile methodologies can be used to increase speed and efficiency in ISD projects. In addition, lightweight agile methodologies are designed, by definition, to minimise wastes in the design and delivery of Information Systems and can therefore be used to support sustainability in IS projects (cf. Schmidt et al., 2009). However, the impact of agile methodologies on ISD project outcomes is less clear. In addressing this question, this research-in- progress paper uses a combination of existing literature and empirical data to con-struct a conceptual framework to explain how three different temporal aspects of agile methodologies (time pressure, polychronicity and periodicity) impact upon decision quality, thereby affecting ISD project outcomes. It is envisaged that this framework will be used to shed light on how agile methodologies impact upon project effectiveness or velocity, which is defined in this context as movement in the ‘right’ direction.