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AlMru+-A computatiortat scheme is presented for the ~~~~n of the optimal design of trusses. Constraints on the desii vi&&es @be cross-sectiomd areas) are considered. I.&ear@ elastic behavior is assumed, and opacity criteria are derived, bostd on strain energy ~~~~s. As in nmtkenmtic& programming techniques, the optimum is approached tbrougk 8 sequence of designs, each diering slightly from its predecessor. The design changes to be made at aech stage of the pruccdure are &term&d by application of the optimrdity criteria. Tim formulation is &ciinUy general to permit the soIution of tke problem of predicting both optimal member size and member layout-given the loads and the lo&on of the joiits. The procedure is illustrated with a number of numerical examples.