When you are dealing with project based work, the scope of the projects can vary and typically are not the type of projects that occur regularly. The main advantage of a Human Resource Outsourcing solution is that you don’t have to hire an HR Team. Rather, you can hire an HR subject matter expert who can work on your specific project or need.
Other advantages include being able to work with multiple experts on an as needed basis, you don’t have to assume the cost or risk of having the expert as a full-time employee and usually there is a cost savings involved if you don’t have to do the work yourself.