Referencia	Título	Categoría
ISO/TC 184/SC 4/WG 12	STEP product modelling and resources	C
ISO/TC 184/SC 4/WG 15	Digital manufacturing	C
ISO/TC 184/SC 4/WG 21	SMRL Validation Team	C

Notas

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.