Abstract
A federal highway administration memorandum was issued in october 1988 concerning the use of prestressing strand in a pretensioned application for prestressed concrete bridges. The restrictions of thememorandum would apply only until research results indicated otherwise. Numerous studies on this topic have been performed, and this article briefly summarizes their results. For some studies, the transfer and development length experimentation is the sole objective of the study; for others, it was an important constituent of a broader objective. All of the studies provide significant contributions to understanding and mathematically defining prestressing strand transferand development lengths.