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A variety of composites comprising complexes between macromolecules and growing species such as macromolecules or particles may be prepared using matrix or pseudo‐matrix processes. Matrix polycondensation of silica acid in the presence of poly(ethylene glycol) and other polymers in benzene resulting in formation of interpolymer complex (IPC) poly(silica acid)‐matrix or composites including the IPC is regarded as an example of matrix processes providing the possibility to synthesize an IPC or composite which cannot be (or hardly may be) obtained by other ways: Theoretical aspects of pseudo‐matrix processes in which pseudo‐matrix macromolecule recognizes (i.e., forms a complex with) a particle of forming new phase and terminates its subsequent growth are discussed. Experimental data dealing with reduction of Ni(II) in polymer solutions and formation of nano‐composites ‘polymer ‐ metallic nickel’ including small particles (3–5 nm in diameter) with narrow size distribution are presented.