How do we evaluate recruitment agencies regarding their quality?

Whenever a recruiter wishes to join us, we speak to them about their process and polices to gain insight about their work. We assess the recruiting company’s information and if we do not find any ambiguity, errors or negative aspects we usually let them work with us.
The next step involves approval process for an agency. After the approval of an agency, its performance is tracked by our team at Change-Exchange and we see how many jobs they are currently working, how many CV’s they have submitted, how many candidate from their agencies get a job and other similar aspects.