The following papers are included: Information engineering - new frontier of technology; Objectives of measurement systems; The design of measurement systems; Parameters; Sampling and statistical design; Transducers; Classification systems for transducers and measuring systems; Data validation; The storage and retrieval of data for water quality control - summary; Data acquisition systems in air quality; Data acquistion systems in meteorology; Data acquisition systems in physiology; Data acquisition systems in water supply; Data acquisition systems in water quality control; Data acquisition systems in hydrology; The interpretation and analysis of hydrological data; Data display for analysis; Techniques for data analysis; Interpretations and conclusions; Summation; Determining basic relationships between variables; Interpretation of trends and cycles; Data interpretation (air) - drawing conclusions; The interpretation of biological data with reference to water quality; Chemistry of natural waters in relation to water quality; Data interpretation (water) - drawing conclusions.