The terms of reference of DG4 are: to advise the CCL on matters relating to cylindrical diameter standards; to produce a working document on principal uncertainty components in measurements of cylindrical diameter standards; and to harmonize the terms and definitions related to the field.

Chairperson:

• Dr Miguel Ramón Viliesid Alsonso  (CENAM)

Members:

• Dr Youichi Bitou (NMIJ/AIST)
• Mr Vaclav Duchon (CMI)
• Mr David Flack (NPL)
• Dr Otto Jusko (PTB)
• Prof. Dr Chu-Shik Kang (KRISS)
• Dr Jong-Ahn Kim (KRISS)
• Mr Oelof Kruger (NMISA)
• Dr Antti Lassila (MIKES)
• Mr Ilker Meral (UME)
• Mr Rafael Munoz (CEM)
• Dr Gian Bartolo Picotto (INRIM)
• Dr Emilio Prieto Esteban (CEM)
• Mr Greg Reain (NRC)
• Mr John R. Stoup (NIST)
• Dr Siew Leng Tan (NMC, A*STAR)
• Dr Rudolf Thalmann (METAS)
• Dr Shihua Wang (NMC, A*STAR)
• Dr Tanfer Yandayan (UME)