The principle of modular structure of crystals has been formulated and the possibility of the tailor-made choice of a specified structure type of compounds for subsequent modular design has been discussed. For some structure types based on cubic close packing, the modular characteristics-the fundamental and basic modules and the module that allows to obtain a certain variety of modular structures related to the initial "parent" type-have been described. The algorithm of choice of such a module has been reported. Compar-ative analysis of the theoretically derived module with the modules of experimentally determined modular structures has been performed for spinelloids, compounds with spinel-like structures.
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