This means there are many parties involved in litigation involving claims from one to another. For example, let's look at a construction site injury. A worker of one contractor who is injured at a construction site due to the negligence of a sub-contractor and a general contractor controlled or directed the sub-contractor. You would have claims for your workers' compensation benefits and then you may have claims against that sub-contractor and the general contractor. As a result the general contractor may have claims against the sub-contractor, you and your employer. These situations get complicated quickly.