The scope of this study was also to compare the test sample preparation and measurement parameters used within the cement industry for a given technique. To facilitate this comparison, participants were asked to provide specific detailed information about their in-house methods. This information was kept confidential, such that no specific technique, method or set of results could be identified with a particular organization. In this section, we will examine the methods used and determine if it is possible to develop a "best practice" that could eventually be presented to ASTM for approval as part of a standard test method. Only the information submitted for laser diffraction will be examined here, as we do not have statistical representation for other methods.