Report Objective: The main purpose of this study was to determine, for machine-picked cotton, the influence of different combinations of cleaning and conditioning equipment on quantity of foreign matter removed, grade improvement, prices received, and bale values. It was recognized that the combination of equipment used may significantly influence fiber length distribution and other quality elements of cotton and may also affect the costs of ginning and related services and the distribution of those costs. Information has not yet been developed on these effects, but it is anticipated that such information will be developed in more comprehensive studies planned for the near future.