A programme of ad hoc modules covering several years shall be drawn up each year according to the procedure laid down in Article 8:
- this programme shall specify for each ad hoc module, the subject, the reference period, the sample size (equal to or less than the sample size determined according to Article 3) and the deadline for the transmission of the results (which may be different from the deadline according to Article 6),
- the Member States and regions covered and the detailed list of information to be collected in an ad hoc module shall be drawn up at least twelve months before the beginning of the reference period for that module,
- the volume of an ad hoc module shall not exceed the volume of the module c described under paragraph 1.
