The Subsidiary Body for Scientific and Technological Advice (SBSTA), at its thirty-third session, welcomed the 2010 updated Global Climate Observing System (GCOS) implementation plan and invited the GCOS secretariat to report on progress made in the implementation of that plan on a regular basis, at subsequent sessions of the SBSTA, as appropriate. In this regard, also at its thirty-third session, the SBSTA encouraged the GCOS to review, in broad consultation with relevant partners, the adequacy of observing systems for climate, such as by updating the Second Report on the Adequacy of the Global Observing Systems for Climate in Support of the UNFCCC. The SBSTA also noted the usefulness of updating the GCOS implementation plan on a regular basis, so as to take into consideration developments under the Convention and their related observational needs. It further agreed to consider issues related to the timing of GCOS contributions to the SBSTA at its thirty-fifth session