The 98 papers from the December 1999 symposium report on new technologies and monitoring approaches in field geotechnical instrument measurements, and case studies on geotechnical projects. Topics: Special lectures: Field measurements and instrumentation in the 20th century; Interpretation of the results of displacement measurements in geotechnical engineering projects; Systematic approach to planning monitoring programs using geotechnical instrumentation: An update. New technologies and developments in field measurements; Management of instrumentation in geomechanics; Deep excavations and retaining structures; Tunnelling and underground openings; Land reclamation, soil improvement, geo-environmental and geosynthetics; Field tests to determine soil and rock properties.