Inputs include knowledge, skills and abilities of group members, the composition of the team, aspects of the task (e.g. task objectives) and organisational context (e.g. reward systems). Process refers to the interaction among group members, patterns of participation in decision making, information exchange, social support and sanctions. Outputs include the products of the group's performance, but they may also include the group members' viability, well-being, satisfaction and development (West & Anderson 1996). Team processes and outputs are connected through team development and norms. Finally there are a number of challenges and pitfalls that can appear throughout any stage of a team's life and these are included in the 'common derailers' section.