Nositelj se može različito prevesti ovisno od konteksta, ali u Vašem slučaju ovo bi bilo primjereno.
Stage 2: Country, site, and implementing agency selection
http://www.iisd.org/casl/CASLGuide/stage2.htm

Implementing Agency
Any of several agencies could be assigned the task of establishing a GHG reporting program.
http://www.pewclimate.org/policy_center/policy_reports_and_a...

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Note added at 2 hrs (2006-03-04 01:23:00 GMT)
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Alternativno: implementing body
The project cycle is being reunified from identification through full implementation and placed in the hands of a new implementing body.
http://europa.eu.int/comm/external_relations/reform/intro/pr...