Extracts from the book The UNIX Philosophy by Mike Gancarz – The Three Systems of Man:

"The third system appears after people become disenchanted with their second system. The Third System is:

• often built by people who have been "burned'' by the second system
• often given a name change to disassociate it with the original obsolete technology
• still contains the original concept intact and is regarded as commonplace

The third system combines the best characteristics of the first and second systems. Its developers are given the time to properly develop the system."