This paper presents an extension of conventional Age X Treatment Interaction, pretest-posttest, and time series designs within the framework of developmental sequences according to Baltes and Schaie. The use of the resulting experimental sequential strategies is based on the assumption that the explication of developmental phenomena is advanced by the systematic exploration of variables whose manipulation leads to the modification and simulation of both age-related and socio-historical changes/differences. Two conclusions are suggested. First, the variables of age, cohort, and time of measurement all become part of the dependent variable and the developmental sequences of Baltes and Schaie are downgraded to merely providing baseline controls. Second, the modification and simulation of age changes/differences represents, at the same time, a modification and simulation of socio-historical changes/differences, and vice versa.
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