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Useful websites and CSGnet

Several independent websites provide in-depth information about Perceptual Control Theory.
For more than sites suggested here, search for William T. Powers on the web.

IAPCT Discourse forum

To join the discussion on the IAPCT Discourse forum, go to discourse.iapct.org and create a Discourse account. See the Forum page of this site for orientation.


This well developed website is maintained by Dr. Warren Mansell from the University of Manchester as an international resource for the dissemination of PCT. Includes information such as what psych students think of PCT, links to YouTube videos, presentations about the Method of Levels and much more.


Originated as a site in support of Phil Runkel's major work People as Living Things, the site expanded to include an extensive list and presentation of PCT literature, post papers on PCT as well as and tutorials and simulations for DOS and Windows computers. The Book of Readings, aka the "PCT Handbook", is a major reference for PCT.


Tim Carey's comprehensive website featuring The Method of Levels (MOL). MOL is a way of talking to people or, perhaps more accurately, a way of helping people listen to themselves, and helping them resolve their emotional distress by themselves, without the therapist "getting in the way" as Tim put it. Note also Tim's blogs at Psychology Today and Mad in America.


Eva de Hullu & Ger Schurink's Dutch website on Method of Levels and PCT. English posts appear on https://methodoflevels.nl/english/.


Rick Marken's website features books, articles, demonstrations and other learning materials. The demonstrations are programmed to run using a web-browser.

PCTresources.com    with CSGnet

Site focused on PCT resources and CSG archives. CSGnet, the email list originated in 1992, can be downloaded from here and read in its entirety. Threads on various subjects, created in the early 1990s, called by some "The Best of CSGnet" are featured as pdf files, ensuring that formatting and ASCII figures are properly displayed.

The email list was shut down in December 2020, but discussion continues on the IAPCT Discourse forum. CSGnet email since 1992 is all included in Discourse. Earlier CSGnet posts from 1990, 1991, and the first part of 1992 are in this archive.


Website supporting The Wonder Weeks: How to stimulate your baby’s mental development and help him turn his 10 predictable, great, fussy phases into magical leaps forward, by Hetty van de Rijt-Plooij and Frans Plooij.
       This book shows how and when the levels of perception outlined by Hierarchical PCT develop in human infants. The English edition enjoys excellent reviews, saying that the predictions about the timing and nature of infant mental development in the first 20 months are right on.


Adam Matic’s demo programs for your browser are Java versions of Powers’ original DOS programs and tutorials, with more conversions to come, such as Living Control Systems III.


Hugh Gibbons' website in support of and as a follow-on to The Death of Jeffrey Stapleton. This site introduces the idea that the sense of justice and law is rooted in our biology and therefore rather uniform around the globe and throughout history. Will is explained using the concepts of PCT.


Website hosted by Dr Rupert Young, an independent researcher and technologist.


Programs for use with Living Control Systems III. You do need the book to properly understand and run the programs.

Personal/partial sites

Bruce Nevin, longtime PCT contributor, has written a number of papers about PCT for linguists and about linguistics for PCT researchers. Here are two:

Richard Kennaway, Research Fellow at the school of computing sciences at the University of East Anglia and collaborator with Bill Powers on Bill's 2008 book Living Control Systems III: http://www2.cmp.uea.ac.uk/~jrk/
Notice Perceptual control theory and robotics as well as Real-time procedural humanoid animation, also an application of PCT.

Bruce Abbott, professor of psychology at Indiana University–Purdue University Fort Wayne (IPFW), collaborated with Bill Powers on Windows programs for Bill's 2008 book Living Control Systems III. Those programs are held in this repository, together with another of other computer programs that were developed to highlight various aspects of PCT. https://sites.google.com/site/perceptualcontroldemos/
He also has a YouTube channel with control-system demos based on the Lego Mindstorms kit.

Management Consultant Fred Nickols has written several papers introducing PCT in plain management language. http://www.nickols.us/controltheory.html Check out the links in red.

Martin Taylor, a long-time contributor to CSGnet considers his Layered Protocol Theory to be a subset of PCT. Here are some of his musings: http://www.mmtaylor.net/PCT/

Allison Powers established a Facebook page, WTPowersArchives, about Bill Powers' personal archives at Northwestern University in Evanston, Illinois. Review and indexing of the materials is underway. Archivist: Kevin Leonard.




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