One advantage to outsourcing is that it forces your to compartmentalize different portions of the project. For example. Having one group develop the server si

One advantage to outsourcing is that it forces your to compartmentalize different portions of the project. For example. Having one group develop the server side software of your application and another group develop the frontend, you are forced to provide a solid black box (possibly through a REST api or something of the sort) to your frontend team. That means documentation (in some form) and it forces your to stick to good coding practices.