Combat Manifestation

(Psionics Handbook 3.0, page 24, DnD 3.0)

[Psionic]

You are adept at manifesting powers in combat.

Benefit

You get a +4 bonus on Concentration checks made to manifest a power while on the defensive (see page 35). The general feat Combat Casting described in the Player's Handbook is essentially the same as Combat Manifestation, and taking either one serves the same purpose, whether for casting spells for manifesting powers (unless your DM uses the Psionics Are Different option described in Chapter 4: Psionics).