Why are processes different colors/Why are some of the inputs/outputs colored?

The APM defines certain processes as being either Governing, Core, or Enabling.  These types of processes were defined by Dr. Michael Hammer.  Below are the definitions used for these process types.

Governing: Guides or direct other processes.
Core: Creates the outputs that meet stated requirements of the Organization.
Enabling: Supports the execution of the core processes.

Some of the inputs/outputs are colored because they have an associated template.