There is one secret to successfully providing interpreting services: hire the right person for the right job.
It’s simple. But it’s not easy.
To do this, you have to know your interpreters. You need to know all about their professional skills – strongest languages, areas of specialisation, simultaneous or whispered, and so on.
You also need to know about them as people. How long they can work without a break. Whether they dress up or down. If they have stage presence, or if they can mirror body language. What makes them laugh; and if they can make others laugh.
Only then can you send the right person to the right job.