[…] the operation Move selects α and raises it, targeting K, where α and K are categories constructed from one or more lexical items [...] The underlying intuitive idea is that the operation Move is driven by morphological considerations: the requirement that some feature F must be checked. The minimal operation, then, should raise just the feature F: we should restrict α in the operation Move α to lexical features [...] we replace the operation Move α by the more principled operation Move F, F a feature.
- Chomsky (1995), Pag. 262

[…] the operation Move F [...] Move raises feature F to target K [...] only if (32) holds, with (33a) and (33b) as automatic consequences, and (33c) a further consequence (assumed, not fully established). (32) a. F is an unchecked feature; b. F enters into a checking relation with a sublabel of K as a result of the operation. (33) a. FF[F] raises along with F; b. A category α containing F moves along with F only as required for convergence; c. Covert operations are pure feature raising.
- Chomsky (1995), Pag. 269-270