The terms of reference of CCT-WG5 are to study and advise the CCT on issues related to thermal radiation methods for temperature measurement and to develop and maintain an effective liaison with the Consultative Committee for Photometry and Radiometry (CCPR).

Working Group 5 is tasked with:

• the evaluation of thermodynamic measurement results at higher temperatures;
  
  
• the examination and coordination of activities related to high-temperature fixed points;
  
  
• providing appropriate input into the mise en pratique for the definition of the kelvin;
  
  
• providing updates for the Supplementary Information for the ITS-90, as required;
  
  
• providing definitive guidance on secondary non-contact thermometry methods, as required;
  
  
• supporting world efforts in thermal imaging standardization;
  
  
• generating appropriate uncertainty budgets for radiation thermometry.