Abstract
The BRST quantization as a quantization method ised. It is pointed out that all formal manipulations are only valid if all inner products in the original state space are finite. This restriction is also shown to be necessary in order to obtain the correct results for trivial models. It is argued that the investigations of BRST invariant states of the form | M〉| G〉, where M and G denote matter and ghost states, are sufficient to determine the physics of the BRST invariant subspace. A prescription of how to solve Q| M〉| G〉 = 0 is given for a general class of models. Solutions are classified into canonical and noncanonical ones. The latter cannot be obtained in a canonical quantization of the corresponding gauge model.
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