After a project WBS and OBS are developed, these documents are used to develop the Resource Assignment Matrix (RAM). The RAM links activities to resources. This matrix is simply a table for which one axis is the project WBS and the other axis is the OBS. Each point at which these two structures intersect becomes a work execution element, and an individual is identified, who is responsible for executing the work. The RAM makes sure that every task is completed by someone. It also gives a realistic picture for perspective investors by showing exactly how many resources are required to finish the project.