Preface -- PART I. GUIDEPOSTS FOR EVALUATION: The scientific importance of experimental data -- The reliability and generality of data -- PART II. REPLICATION: Direct replication -- Systematic replication -- PART III. VARIABILITY: Intrinsic vs. imposed variability -- Variability as a scientific and as an engineering problem -- PART IV. EXPERIMENTAL DESIGN: Pilot studies -- Steady states -- Steady states (continued) -- Transition states -- Selection of an appropriate baseline -- Control techniques -- Control techniques (continued) -- Appendix: A terminological note.