ABSTRACT
An analogy may be made with the management of football teams. Managers of teams are generally aware of what is needed to win a match. They have a fairly good idea of the pattern of success. So usually have their opponents. But it is by no means so easy to translate the ideal into reality on the field of play for many reasons, including the behaviour of the competition. What can be recognized ex post cannot always be controlled or initiated ex ante. Many of the variables involved are in any case not easy to manipulate.
