Some of the Groups have restricted-access websites containing their working documents. Where access is restricted to working group members, a username and password are required.

	CCTF Working Group on TAI (WGTAI)      (chair: Dr P. Tavella, INRIM)
	Sub-Group of the CCTF Working Group on TAI: Algorithms      (chair: Dr P. Tavella, INRIM)
	CCTF Group on GNSS* Time Transfer Standards (CGGTTS) * GNSS = Global navigation satellite systems      (chair: Dr J. Levine, NIST)
	CCTF Working Group on Two-Way Satellite Time and Frequency Transfer (TWSTFT)      (chair: Dr D. Piester, PTB)
	CCTF Working Group on Primary Frequency Standards (WGPFS)      (chair: Dr T. Parker, NIST)      Terms of reference      Discussion forum
	CCL-CCTF Frequency Standards Working Group (WGFS)      (joint chairs: Dr F. Riehle, PTB, and P. Gill, NPL)
	CCTF Working Group on the CIPM MRA (WGMRA)      (chair: Dr F. Cordara, INRIM)
	CCTF Working Group on Coordination of the Development of Advanced Time and Frequency Transfer Techniques (WGATFT)      (chair: Dr P. Tuckey, LNE-SYRTE)      Terms of reference
	CCTF Working Group on Strategic Planning (WGSP)      (chair: Mr Luc Erard)      Terms of reference