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In this paper, we show minimal just-identified restrictions for a class of selection models. We deepen our knowledge about selection on observables in three directions: First, we show that the model proposed by Rosenbaum and Rubin is just-identified. Second, we show that although their assumptions are not minimal, the weak selection on observables (WSO) hypothesis we introduce does, in fact, generate a set of minimal just-identified assumptions. Finally, we show that the WSO hypothesis has andoi:10.12660/bre.v30n22010.3695 fatcat:chg4qd5oefgpbm277n3drhmu6e