THIS CHAPTER COVERS THE IMPORTANCE OF PROperty making and curing concrete test specimens in both the field and the laboratory. This subject was covered in ASTM STP 169 [1] in the chapter Static and Fatigue Strength authored by C. E. Kelser and C. P. Siess. In ASTM STP 169A [2], this became a separate chapter authored by T. B. Kennedy. In ASTM STP 169B [3], this chapter was authored by R. F. Adams. In ASTM STP 169C [4], this chapter was under the present authorship.