The Matrix Organisation Chart
The value of a matrix organisation chart it allows you to have a focused view of the people and functions pertaining to that project.
If we filter all of the people on Project X, they can be plotted according to functional area and also management level. In the matrix org chart we are not as concerned about who reports to whom, but rather what results resources are assigned to produce. What you see below is a 2-dimensional matrix org chart that emphasizes function rather than hierarchy. Management can use this view to make sure they have the right people, the right number of resources, and right placement on the organisation.
Here is a common, somewhat old-fashioned approach showing the basic idea of a matrix org chart.