2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/193975Einstein's field equations with variable gravitational and cosmological ``constant'' are considered in presence of perfect fluid for Bianchi type-I spacetime. Consequences of the four cases of the phenomenological decay of $Λ$ have been discussed which are consistent with observations. The physical significance of the cosmological models have also been discussed.12 pages, no figureGeneral Relativity and Quantum CosmologyBianchi Type-I Cosmological Models with Variable G and 4Λ$-Terms in General Relativitytext