Who will make them do it?

An interesting point has been raised by One World Trust in their recent study of development effectiveness initiatives run by NGO partnerships:

"self-regulatory initiatives frequently lack enforcement mechanisms...this can sometimes lead to free riding (signing up to the initiative purely to show the organisation in a good light - without any real action on the part of the NGO to implement)."

There's quite a fashion for self-regulatory NGO bodies: Global Effectiveness Framework for NGOs, G3, INGO Accountability Charter and the BOND Statement of Principles.

Few have a sanctioning mechanism.

How can donors and taxpayers effectively demand for rigorous, enforced regulation?