Developed by Sarantis Pavlidis
There are various definitions of what a team is about. However, one of the most well-known is the one given by Katzenbach and Smith (1993)  according to which the team is a small number of people with complementary skills - talents dedicated to a common purpose, a set of performance objectives and an approach for which are mutually responsible. This definition is an extension of the definition given by Adair (1986)  as the responsibility of the members added at the latest's data. An important feature of the teams added by Mankin, Cohen and Bikson (1996)  is the interdependence of individual's activities, as the work of each member is dependent on the work of at least some other's members. Larson and LaFasto (1989)  also emphasized that the core element of the team is also the coordination of the activities of its members, which is necessary to achieve the objectives. Even earlier, Francis and Young (1979)  had spoken of an active set of people who are dedicated to achieving common goals, working successfully together and producing high quality results whilst taking pleasure through it. An advanced definition is also given by Kur (1996)  who examined the team as an open, goal-oriented , socio-technical system in a tension state between change and stability.
In addition,  It refers to a process and activities for improving team performance. This article focuses on people perspective as an aspect of project management and provides an overview of the stages of team development. Design of Team Development and how to manage team conflicts are also mentioned. Members of a project team can use the current article to identify the team structure, to understand the stages of developing a team or to deepen their knowledge of the subject. The model can be used in any industry where people are involved to perform teamwork in a project. For example in constructions, information technology, mechanical engineering, civil engineering etc. Effective collaboration is crucial to the success of a project.is a method for developing a project team.
There are some objective criteria that characterize a successful team which works effectively and efficiently. There are eleven points which are consist of such a team 
- ↑ Katzenbach J., Smith D., 1993, The Wisdom of Teams, Harvard Business School Press, United States of America, McKinsy & Company, Inc
- ↑ Adair, J., 1986, Effective Team building, Gower, Aldershot
- ↑ Mankin D., Cohen S., Bikson T., 1996, Teams & Technology, Harvard Business School Press, United States of America
- ↑ Larson, C., LaFasto, F., 1989, Teamwork, Sage Publications, Newbury Park, CA
- ↑ Francis, D., Young D., 1979, Improving Work Groups. A Practical Manual for Teambuilding, University Associates, La Jolla, CA
- ↑ Kur, E., 1996 The faces model of high performing team development, Leadership & Organizational Development Journal, 17, 1, 32-41
- ↑ Page 319, A Guide to the Project Management Body of Knowledge (PMBOK® Guide) - Sixth Edition (2017) - Project Management Institute
- ↑ Thomas L. Quick, "Successful Team Building" (The WorkSmart series), American Management Association, New York, AMACON.