INTRODUCTIONThe API Southwestern District Study Committee on Casing Landing Practice* was organized in March@ 1952. Its objective was "to prepare a recommendation on a standard procedure for landing and hanging casing from the time the cement plug hit bottom until the time the casing hanger was installed and the casing set on the hanger@ being held by slips or threads." Preliminary activity included considerable investigation of past reports@ records@ and correspondence covering the subject and a questionnaire was circulated to the industry in the southwestern United States. A summary of the data obtained by the questionnaire is presented as Table 1.More detailed information on committee activity and discussion appears on p. 10-15 in "Reports of Meetings@ Southwestern and Mid-Continent District Drilling and Production Practice Committees@" API Circ. D473@ May 10@ 1954.*Chairman: H. M. Krause@ Jr.@ Humble Oil Refining Co.@ Houston@ Texas.