The first example is the PC stack, shown here as a pileup of People-Product diagrams.

Particularly noteworthy about this example is the diversity of communities that collaborate in putting the pieces together so that a user (at the right end) can edit a document using a PC. Many of these people have different educations, conceptual modelsof their working domains, and working vocabularies. Their general skill categories are shown at the top.

A good set of interface specification standards is what has brought them together.