Interferometer is a complex system. When building models, doing calculations of such a complex system, we can easily make mistakes. But we cannot afford a mistake in the design of an expensive instrument. In order to prevent serious mistakes, we require that at least two people have to understand a program code written by someone so that they can cross check the code. Analytical calculations also have to be cross checked by other people.
We will try to assign multiple people to a task to fulfill this requirement. If it is not possible, we will assign reviewers for that task.