A collection of principles, theories and models relevant to Agile

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Which principles, theories and models do you know that help to explain how Agile works, and why it works? Which one would you add to this list?

This below is a list of few principles, theories and models relevant to Agile, how it works, and why it works.
The less known include the names of the authors.
The list is ordered by date.

Which other principles, theories and models would you add to the list?

  • End of the 18th century: Gordian knot (a metaphor and an early reference to intractable problems)

  • 1967-1970: The Wicked Problem definition from  C. West Churchman, Rittel and Webber

  • 1985-1987: VUCA world definition from Warren Bennis and Burt Nanus

  • 1991-1996: Complexity Science and Complex Adaptive (Socio-Technical) Systems applied to Management theory from Ralph Douglas Stacey

  • 1996: Ralph Douglas Stacey’s Matrix

  • 1995: Scrum: the 3 pillars  (later supplemented with 5 values)

  • 1995: DSDM/Atern 8 principles (originally 9)

  • 1996-1999: Extreme Programming with 4 values and 5 principles  (later developed into 5 and 13 respectively)

  • 1999: Cynefin framework from David Snowden

  • 1991-2004: Crystal Clear with 7 properties

  • 2001: Manifesto for Agile Software Development: the 4 values and 12 principles

  • 2003: Lean Software Development with 7 principles

  • 2003-2013: Agility definition with 6 characteristics and 3 variables from David S. Alberts

  • 2003-2013: Manoeuvre Agility from David S. Alberts

  • 2003-2013: NATO NEC C2 approaches space from David S. Alberts et al 

  • 2016-2018: Kent Beck’s 3x