Editing Alternative keyboard layouts (section)

=== Evolved ===
{{infobox layout
| name       = Evolved (Second Experiment)
| image name = Klausler-Evolved.PNG
| creator    = Peter M. Klausler
| license    = None
| introduced = 2002 <ref name="evolved-intro-date">[https://web.archive.org/web/20020708141220/http://www.visi.com:80/~pmk/evolved.html Evolved Intro Date]</ref>
| website    = [https://web.archive.org/web/20060721141015/http://www.visi.com:80/~pmk/evolved.html Evolved (archive)]
| top row    = K,UYP WLMFC
| middle row = OAEID RNTHS
| bottom row = Q.';Z XVGBJ
}}

Evolved was released around 2002 on Peter Klausler's own website. During his use of Dvorak he wondered how a better modern layout could be created with the aid of computers. A metric of "work" needed when touch typing with each layout was developed. The factors of what constituted work were as follows:
* All 8 fingers start on the home row.
* An index finger stretch to the center costs 1 unit.
* Fingers of the same hand can't be on both the top and bottom row.  When a top-row or bottom-row key is to be hit, each finger on the bottom or top row (respectively) moves to the home row, and that costs 1 unit each.
* After that, if a finger has to move up or down to hit the key, it costs 1 unit.  An additional unit is charged to move to the bottom row (except for the index finger in its natural column) or to move an index finger to the top row in its unnatural center column.  Furthermore, moving a pinky up or down costs an additional unit.  I have weak pinkies.
* Hitting two distinct keys in succession with the same finger is really bad; 3 more units are charged.
* An extra unit is assessed when nonadjacent fingers of the same hand are used in succession and they are not both on the home row.
* But adjacent fingers are charged a unit to hit keys on distinct rows, and one more if there's adjacent movement between the top and bottom rows.
* When a shift key is used, the fingers of the shifting hand move to the home row for free afterwards.
These rules were applied to a corpus of 20mb of English text from books, the bodies of all the authors emails, and about 100k lines of C code. This was to best reflect the authors typing habits. Along with the text samples there was the layouts which were generated programmatically. Additional considerations were added to the layout generation program for alternating hands and adjacent key hits (rolling) after real world testing. Klausler ended up switching back to Dvorak layout.
<ref name="evolved-home-page">[https://web.archive.org/web/20060614221712/http://www.visi.com:80/~pmk/evolved.html Evolved Home Page]</ref>
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