Research Issues in OD Evaluation: Past, Present, and Future

Early OD evaluation concerns at the macrolevel dealt principally with research design complexities.Current microlevel research is concerned largely with technical issues related to the accurate measurement of change.It is suggested that future evaluation research should continue this macro- to micro- evolution by (1) reconciling certain current differences and testing new methodologies; (2) drawing on studies dealing with time-order error; and (3) investigating questions of "time interval" and "measurement span" associated with longitudinal research designs.