The 4 antecedents (Carron)
Personal factors- similarities in values, how fit they are, level of motivation shown, how satisfied you feel with the group, age, gender, ability etc.
Leadership factors- leadership style, relationships between leader and group members, effect a captain has on the team
Team - the stability of the group, common experiences in victory and defeat, common will to win, ultimate goal, more success=more cohesion
Environmental factors- whether a player has a contract or scholarship, their location, age and the size of the group