Our work in the Bahamas, Turks and Caicos, Haiti, and Jamaica has revealed significant patterning in apparently unretouched molluscan shell objects. In the present paper we conclude that repetitive patterns in shell breakage, especially of queen conch (Strombus gigas), reflect the specific manufacture of forms for use as expedient tools. Expedient tools exhibit only primary modification in which a portion of the source material is removed and shaped, but there is no specific evidence for the preparation of a work edge. Alternatively, expedient tools may display no modification of the raw material except that produced through use. We hypothesize that through controlled breakage large S. gigas and other mollusk shells were modified to create numerous smaller pieces for everyday domestic activities. The key factor here is human intent. Experiments clearly demonstrate that controlled breakage of adult shells produces predictable fragments. Among these are forms that occurred in prehistoric sites throughout the West Indies; many of these forms also exhibit signs of use wear. This type of regional comparison and analysis is important for all archaeologists who work in coastal settings. It is only through such general studies that the sample size is sufficient to facilitate a more complete reconstruction of the aboriginal tool kit.