The thing to consider in this scenario is groups versus individuals. Kerr & Park (2003) state, ‘…the effect of the presence of others on performance, one of psychology’s oldest questions, remains relevant for the study of group performance.’ When one is working on a project alone, they have no option but to put in one-hundred percent effort and remain motivated throughout in order to be successful. However, when they are part of a group-effort, they are able to slack in performance and still have a fighting opportunity for success. I can refer personally to group-work in which I was involved in back in my secondary school days. I was part of a group called ‘Young Enterprise’ where I acted as an assistant to the marketing director, along with two other members. We were entrusted to handle the advertising of our product, and obviously had to work together but also had individual tasks. I was not prepared for the role when I assigned to it, and often passed my work onto the other assistants. Propp (1999) believes it is necessary ‘…for members to share their individual knowledge with the group and for the group as a collective unit to evaluate and use effectively its member’s informational resources...’ in order to succeed.
Working in a group can be seen as a way of encouraging motivation and in-turn helps the success of the task in question which is known as Social Facilitation; this represents a process in which people 's performance varies depending on whether or not they are in the presence of others.
References: Kerr & Park (2003). Group performance in collaborative and social dilemma tasks. In M.A. Hogg & R.S Tinsdale (Eds), Blackwell handbook of social physcology: Group processes (pp. 107-138) Malden, M.A: Blackwell Brown, R. (2000). Group Processes. Oxford: Blackwell. Chapters 1 & 2 Baron, R.S. & Kerr, N.L. (2003) Group Processes, Group Decision, Group Action, Buckingham: OUP. Chapter 1 Engleberg, I.N. and Wynn, D. R. (2003). Working in Groups (3rd edition). Boston, MA: Houghton Mifflin. Chapter 1 Hargie, O. (2011). Skilled Interpersonal Communication: Research, Theory and Practice (Fifth edition). London: Routledge. Chapter 14