The stages of development within the groups were described by Bruce Tuckman in the year of 1965. The groups must go throught these phases to reach their maximum effectiveness.
Stagew one is forming. At this stage the acceptance of the individual within the group is important. Focus will be on the fulfillment of common objectives and also on individual tasks. People know each other.
Stage two is storming, within which the group remains cordial but minimal confrontations will appear. To move on to the netx phase you must learn to handle conflicts.
Stage three is norming, individuals feel part of the group.
Performing is the final stahe where the group maintains a stage of independence and flexibility. They work together and trust them. In the latter the group has the greatest possible cohesion due to all the work done previously.