Senior referees, instructors, and assessors are continuously consulted regarding the effectiveness of the standard mechanics, procedures, and signals which are expected to be used by officials in this country. These officials are on the front line in developing methods for handling new situations. Such methods are tried, revised, discussed, and gradually fine-tuned before they are ready to be declared a "standard" procedure for use by all referees.
As a result of this process, two relatively minor changes are being introduced in 2008 in accepted mechanics, effective as of this memorandum. They will be incorporated into the 2008 version of the Guide to Procedures for Referees, Assistant Referees and Fourth Officials, soon to be available from USSF. These revisions should be incorporated into your referee training programs as soon as possible.