The vast extent of the investment in concrete structures in modern times has emphasized the need to maintain these structures in a systematic manner, so that they retain their structural integrity and full usefulness. Such maintenance must be preceded by regular and thorough inspection. This Guide to Good Practice describes the many types of damage - slight or more serious - which may be discovered and the equipment used to carry out inspections. Suggested inspection intervals, related to the severity of loadings and environmental conditions, are given.