KAYNAK:  http://circa.europa.eu/irc/dsis/employment/info/data/eu_lfs/lfs_main/adhoc_modules/adhoc_modules_mainpage.htm

KAYNAK 2: http://circa.europa.eu/irc/dsis/employment/info/data/eu_lfs/lfs_main/adhoc_modules/2002/Module2002.htm

EU LFS ad-hoc modules

Since 1999 an inherent part of the European Union labour force survey (LFS) are the so called 'ad hoc modules'. The Council Regulation
No 577/98 specifies that a further set of variables may be added to supplement the information from the core questionnaire of the LFS.
A programme of ad hoc modules covering several years shall be drawn up each year according to the procedure laid down in Article 8
(Regulation No. 577/98):

- 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 Core and outside the core questionnaire.

The topics of the ad hoc modules are listed below.

- Modules by year

From 1999, a set of questions is added to the Labour Force Survey on a yearly but rotating basis.

* Anonymised data sets for researchers only

- Selection of topics  (see LFS Main page, section Regulations)

The ad-hoc modules are set by Commission regulation by group of three years:

. 

- LFS core variables and publication thresholds

The LFS core variables available for each year are described in the section LFS userguide and Annexes

Special reliability limits apply to the results because of the specific topic surveyed and/or the specific reference period and sample: see ad-hoc modules reliability limits.