The DSM (Design Structure Matrix) is the basic matrix. It is used to relate entities of one kind to each other, e.g. the tasks that constitute a complete project, and it can be used to identify appropriate teams, workgroups, and an ideal sequence of how the tasks can be arranged.
A DMM (Domain Mapping Matrix) can be used to establish a mapping between two different views of a system, e.g. to relate functions to the component architecture. The tutorial will show you how to model, analyze and improve such a mapping.
The MDM (Multiple-Domain Matrix) combines DSM and DMM into a complete system model. As such, a complete system can be represented and managed.
In 2013 a webinar series was created was created for the DSM Industry Special Interest Group. You can find those tutorials here.