Articles in this special issue suggest improvements in longitudinal program evaluation to meet the challenges of evaluation of human services programs. Contributions describe innovations in design, methods, data analysis, utilization, and interpretation of the findings of longitudinal studies. (SLD)

A between method triangulation strategy was used to evaluate a process for long-range program planning. One study team conducted interviews and the other used a mail questionnaire. The resulting problems in coordination between teams are discussed. (Author/GDC)