(a) Update and report on observational data requirements of the WWW as well as other WMO and international programmes supported by WMO;

(b) Review and report on the capability of both surface-based and space-based systems that are candidate components of the evolving composite GOS;

(c) Carry out the rolling requirements review of several application areas using subject area experts (including atmospheric chemistry through liaison with CAS, marine meteorology and oceanography through liaison with JCOMM, aeronautical meteorology through liaison with CAeM, agrometeorology through liaison with CAgM, hydrology through liaison with CHy, and climate variability and change detection through liaison with CCl and GCOS);

(d) Review the implications of the Statements of Guidance concerning the strengths and deficiencies in the existing GOS and evaluate the capabilities of new observing systems and possibilities for improvements and efficiencies in the GOS;

(e) Carry out studies of real hypothetical changes to the GOS with the assistance of NWP centres;

(f) Develop new version of the Implementation Plan for Evolution of the GOS based on the Vision for the GOS in 2025, taking into account developments with respect to WIGOS and GEOSS; monitor progress against the Plan, report progress and updated Plan through ICT-IOS to CBS;

(g) Prepare documents to assist Members, summarizing the results from the above activities.

(h) Provide advice and support to the Chairperson of OPAG-IOS on development and implementation of WIGOS concept.