2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27293We give a brief review of recent developments by the variational Monte Carlo method, in addition to some new results. We discuss $t$-$J$-type models: the ordinary $t$-$J$ model in one and two dimensions, and the one-dimensional supersymmetric $t$-$J$ model with the long-range coupling of inverse square.10 pages, LaTeX. Hard copy of 7 figures are available on request. To appear in J. Phys. Soc. Jpn. Suppl. (1995)Condensed Mattertext