A number of general-purpose, reasonably accurate and well-tested
ab-initio codes for crystals are discussed in this book. The aim is to
expand competence of their application in material sciences and
solid-state physics. The book addresses particularly readers with a
general knowledge in quantum chemistry and intends to give a deeper
insight into the special algorithms and computational techniques in
ab-initio computer codes for crystals. Three different programs which
are available to all interested potential users on request are
presented.