An employer who wishes to change the terms in individual contracts of employment to the detriment of the worker, e.g. lower his wages, introduce new working hours etc., must do so in accordance with the general notice periods which apply to termination of employment provided for under the applicable collective agreement. The worker can choose to regard such a notice of change as a final notice of termination of his employment contract. If he chooses to do so, he must notify the employer as soon as he can. If he does not, his silence will be regarded as accepting the changes which come into effect when the notice period has expired.