What of these other fours?
 Post appears BELOW Table of Contents.
 This blog focuses on similarities between others' four-folds, tetrads, tetrachotomies, and mine, and includes links to online information on others’ fours in their own terms. It results from overgrowth of an old post at The Tetrast "What of these other fours?".
Table of Contents

Fours that I've
adopted or adapted:
Fours with a striking
likeness to mine:
Fours involving some
likeness to mine:
More-or-less different fours:
Unless otherwise stated within the post, first posted on Friday, December 5, 2008. Post times here are just a device to control the order of appearance. Most of the posts are based on entries in an older post "What of These Other Fours?" at The Tetrast.
Robert Worstell's tetrads of ideas
Robert Worstell's tetrads of ideas (e.g., Ability as analyzed into “Purpose, Confront, Responsibility and Understanding”. He has several blogs on various subjects. I didn’t grasp the pattern in his tetrads, and possibly he’s not primarily seeking a particularized, family-resemblance kind of pattern in the sense that I do. Anyway, his criteria include: interaction and mutual enhancement of a tetrad's four points; a kind of tetrahedron-like philosophical stability of such tetrad; and productive results following soon upon application in practice. He linked to the version of this post at The Tetrast. He adds that, at his current blog(s), “tetrads have been updated to ‘four-way thunks,’ but I do have a Lulu book which contains the original doctorate thesis.”
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