CONTENTS:- The nature of quantitative plant ecology and vegetation science; The description of vegetation in the field; The nature and properties of vegetation data; Basic statistical analysis of vegetation and environmental data; Ordination methods I, 1950-70; Ordination method II, 1970-92; Phytosociology and Zurich-Montpellier (Braun- Blanquet) school of subjective classification; Numerical Classification and Phytosociology; Computer programmes for vegetation and environmental data analysis; Quantitative plant ecology, vegetation science and the future.