2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72072Necessary and sufficient conditions are given for when a sequence of finite dimensional subspaces (X_n) can be blocked to be a skipped blocking decompositon (SBD). These are very similar to known results about blocking of biorthogonal sequences. A separable space $X$ has PCP, if and only if, every norming decomposition (X_n) can be blocked to be a boundedly complete SBD. Every boundedly complete SBD is a JT-decomposition.11 pages, 0 figuresFunctional Analysis46B20 (Primary); 46B15, 46B22 (Secondary)text