The "Kraith" series, created by Jacqueline Lichtenberg before she went pro, were stories, poems, articles and novellas published in several fanzines, including T-Negative and Berengaria. Several writers worked on Kraith including Joyce Yasner, Shirley Maiewski, Sondra Marshak and Joan Winston. I got hold of these in the form of Kraith Collected in which the stories are presented in the proper chronological order. They were my first real look at Alternate Treks. All of Kraith Collected is now online and readable for free at Kraith Collected Online.
One of the things that comes up is a 0 to 100 psionic ability scale, I don't remember exactly how it functioned in the Kraith setting. However every being had a psi rating from "psi-null" psionic brick to Ghodd-like. I developed this scale from that idea. I use this scale and call it the Kraith Scale because that is where I got the idea from. --Garry Stahl
The Kraith Scale
0-10 sub psionic -- mental bricks -- nearly impervious to psionics. Damaged Humans and other races. No known sentient species is normal down here.
11 to 40 is non psionic. -- Typical Humans and other non psionic races. -- Highly resistant to psionics.
41 to 55 is sensitive range -- No real "usable" ability, but can sometimes get things to work. -- Psionic doormats. Crippled Vulcans, half breeds of various Psionic races, some unfortunate races. Some Humans
56 - 70 is low ability -- Usable ability -- decent resistance. Vulcans fall in here as do most psionic Humans.
71 - 85 is moderate ability -- Considerable ability -- resistance equal to non-psionics. Betazoids and so forth
86-100 is high ability -- Do the really spectacular stuff -- as good or better resistance than bricks. Ane, Melkot, such creatures.
"0" and "100" are the theoretical minimum and maximum that cannot be attained.