An overview, recent developments, and future perspectives of the Monte Carlo shell-model (MCSM) calculations are described. The advantage of the MCSM over the conventional diagonalization method, its applicability to huge systems in large model spaces and with many valence nucleons, is clarified through various practical examples. An attempt to describe many nuclei in a wide-mass range with a unified framework is presented. In order to obtain reliable effective interactions for such purposes, we can modify microscopic interactions empirically by using the information from experimental data.
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