Properly designed and manufactured concrete that is handled and placed correctly will perform well under rigorous conditions. On occasion, unfortunately, some aspect of quality concreting is slighted. Like a child, concrete can be spoiled when it is young- and the adverse results are frequently most noticeable after the passage of a few years. It is for this reason that planned periodic inspection of concrete after it has been placed in service is becoming increasingly common. There are two general types of inspections: the isolated inspection and continuing inspections. The former is done usually to determine the acceptability of concrete in a structure that is newly built or whose purchase is under consideration or in response to signs of distress in the concrete. In order for the inspection reports to be of value, evaluations of the condition of the concrete must be standardized as much as possible. Much confusion would result if an examination of a series on inspection reports covering a period of time indicated that evaluations of concrete deterioration in the structure varied up and down. If different inspectors examine a structure and no clear cut criteria are established for evaluating the extent of concrete deterioration, reports of confusing variety are likely. Another valuable aid to concrete inspectors is the group of recommended practices and guides established by the American Concrete Institute. What has been missing, however, is a comprehensive guide to inspecting concrete is service. To help fill the gap, the ACI Journal in its November 1968 issue published the report of ACI Committee 201, "Guide for Making a Condition Survey of Concrete in Service." This guide sets up a system for reporting the condition of existing concrete in a manner that renders the report of greatest value both for single inspections and for services of inspections designed to document the rate as well as the extent of deterioration. ACI 201 does not eliminate the need for experience and intelligence on the part of the inspector, but it does offer (1) a standardized, systematized checklist of points to include in the inspection report and (2) clear definitions of terms frequently used to report concrete deterioration.