Every single task from the moment a clinical trial is conceived to the moment it is submitted to the FDA with complete data as part of a larger submission may be handled by a company or a consultant. There are companies that play every single role in the trial, if you just look hard enough, and most of the time they are rather easy to find. Clinical Research Organizations, depending on their size, will do most of this stuff.

But should they?

If you are a company running a clinical trial, what factors should you look at to decide whether to run the trial yourselves (i.e. do all the recruiting, monitoring, training, etc.) or to let a CRO do it?