After filing suit, there will be an initial case management conference (CMC), and a lengthy period for civil discovery. This process means both sides get to ask each other written questions and demand documents and things.
If one side feels like the interview process is not being satisfied, a motion to compel and for sanctions may become filed when parlay and negotiations fail to bear fruit.
Depositions are often taken as well during this process. During this process, each side gets to submit oral questions to witnesses in person, under penalty of perjury. Once the interview process is over, additional items or witnesses may be subpoenaed if necessary.
Typically, motions for summary judgment/adjudication will get filed after or during discovery.