Abstract: This metric is the ratio of the maintenance personnel who are actively doing the maintenance work (direct) to the maintenance personnel supporting the maintenance work (indirect). Direct personnel include those workers in the maintenance department that repair, maintain, modify or calibrate equipment.
MIDI (Musical Instrument Digital Interface) is a protocol designed for recording and playing back music on digital synthesizers that is supported by many makes of personal computer sound cards. Originally intended to control one keyboard from another, it was quickly adopted for the personal computer.
The MIDI protocol was conceived as a device control protocol, like the Postscript or PCL protocol that sends data from a desktop computer to its printer. Today's word processing applications don't make the user edit printer data. Yet today's music sequencers are very much bound up in the MIDI protocol.