The playing system determines the functions, tasks, starting positions and the operating area of all players. The more perfect the playing system, the smaller the chance of misunderstanding amongst the players. In common playing situations each player should know exactly what, when and how he/she should perform. Within the rules of action accepted by the team there should remain a certain space for individual creative solutions of unusual situations. The choice of playing systems both in training and in matches depends on: µ qualification and level of players, mainly the key ones µ opponents’ playing systems µ development of the match Consequently every team should master several attack and defence systems, which they should be able to use favourably and change quickly according to the situation. The ability to change quickly and fluently from an attack to a defence system and vice versa is also very important. 1.Basis of Co-operation in Attack and Defence The co-ordinated action of two players creates the elements of co-operation. More complicated structures can be developed by putting together the following elements. λ The elements of co-operation in attack can be combinations based on: Passing: the task is to pass the ball to a better positioned fellow-player (Diagram1). Diagram1 Changing positions (most often in the form of crossing): the task is to damage the co-operation of the defenders by changing the attack area ( Diagram 2). Diagram2 Screening: the task is to stop a defender from moving in a certain direction (Diagram 3).