Reference	Title	Category
ISO/TC 261/WG 2	Processes, systems and materials	C
ISO/TC 261/WG 3	Test methods and quality specifications	C

Notes

Liaisons A: Organizations that make an effective contribution to the work of the technical committee or subcommittee for questions dealt with by this technical committee or subcommittee. 
Liaisons B: Organizations that have indicated a wish to be kept informed of the work of the technical committee or subcommittee. 
Liaisons C: Organizations that make a technical contribution to and participate actively in the work of a working group.