How to find a professional conference interpreter

The need for Professional Conference Interpreter is increasing day by day as the growth in world trade. Increase in need of working languages converting consecutive interpretation to Simultaneous interpretation rapidly.
In the fast faced world we have very less time to go through the process to select an Interpreter, but this is unavoidable process and we need to make sure that our conference and speech has reached the delegates or Audience as fresh and accurate in our minds.
The quality of interpretation is based on the model it is delivered to the audience with crisp and effective output.  The interpreter should be a good speaker and express the speech with life in it and very accurately with good sentences and should make sense all the time.
As you know the Conference Interpreter has very little time to actually work and deliver the interpretation and we need to provide him with all the documents of speech, Domain terminology and if possible a translation of same well in advance.
Many interpreters claim to be a good at interpretation, but they lack in Domain expertise and good in their Language. A professional conference interpreter is one who has good knowledge of using the interpretation equipments, Best knowledge of the Language and Terminology for a particular domain.
Generally we will have more than 1 interpreter available in the Booths, this will help them to work as a team and shift the interpretation between them. When you are not interpreting you need to still listen and make notes. This will help the conference to have a maintained terminology used with proper sentences.
Interpreter should be having more than 5+ years of experience and good command over working Languages.

Checklist:
1.    Interpreters Experience
2.    Command over language and domain terminology
3.    Good speaker with effective speech in general
4.    Availability of references for the past work done