The psionicist's skills are based on the Wisdom and Constitution ability scores, and while humans can attain higher levels of expertise, all races are eligible for the class.
[1] The book has a discussion of society's reaction to psionicists, and a section describing the role of psionics in various TSR campaign settings.
[1] The Complete Psionics Handbook was published as a 128-page softcover book by TSR, Inc., with design by Steve Winter, and monster updates by Blake Mobley.
Editing was by Andria Hayday, with illustrations by Terry Dykstra and Dee Barnett, and graphic design by Stephanie Tabat.
[1] Swan gave the book a positive review, stating that while the large increase in the complexity of psionics from the 1st edition was intimidating, the system itself was straightforward and highly playable.
While it could have been stronger in some spots, and the combat system could have used some more work, the Psionics Handbook is overall a fine addition to the gaming shelf of any AD&Der wanting to use psychic abilities in his/her campaign, and as a source material for gamers of other systems interested in adding a wide variety of different psychic powers to their campaigns.