What can a testing service do for the construction industry? This question should be given serious consideration by contractors, architects, engineers, material suppliers, and owners. Unfortunately, this service usually does not show visible sings of contribution to a project. Since the benefits of a testing service do not necessarily increase production, sales and profits, those who can benefit seldom evaluate it properly. Most owners are unaware of what a testing service can do for their project and let the architect-engineer handle this work, or have the contractor engage the testing service. In many cases this results in contractors feeling they "own" the testing service, since they are required to "engage and pay the expenses of a testing laboratory acceptable to the architect-engineer." Contractors are accustomed to taking competitive bids from their subcontractors and the same procedure is used in engaging a testing laboratory. This has done much to prevent the development of a more professional attitude on the part of testing services. Therefore, the testing service should be retained by the owner to perform the field inspection of all concrete. This should include testing for slump, yield and percent of air for air-entrained concrete. Many times one can examine these data and develop reasons for low compressive strengths. Also the testing laboratory should be charged with the making and handling of concrete cylinders. A fair percentage of cylinders made on the job by inexperienced labor are improperly made and the tests for these cylinders are frequently meaningless.