The Tell el-Hesi site comprises a 25-acre walled city from the Early Bronze III period. It is located on the southeastern edge of the Mediterranean coastal plain, 26 km northeast of Gaza in Israel. Tell el-Hesi was the first Palestinian site at which the principles of ceramic chronology and of stratigraphic excavation were applied and at which the relationship between pottery and stratigraphy was shown to be significant. In 1890 W.M. Flinders Petrie excavated at Hesi and produced a general picture of its occupational history. In 1891-92, F.J. Bliss excavated stratigraphically through each successive level of the mound and identified eleven occupational levels which he grouped into eight strata or "cities". In 1970, The Joint Archaeological Expedition to Tell el-Hesi, sponsored by the American Schools of Oriental Research and a consortium of educational institutions, entered the site with the objectives of investigating in greater detail and with more refined methods the stratigraphic divisions identified by Petrie and Bliss. This book appears as the fourth volume in the Joint Expedition's series of final publications regarding their field experience and findings. The Joint Expedition had its first field season in June 1970 and returned to the site for further excavation in the summers of odd-numbered years. The first four seasons (1970-75) have been designated Phase One, and were largely limited to the later occupation levels on the summit and southern slope of the site's northeast hill or acropolis, although there were also probes and limited exploration of the larger Early Bronze (EB) city. The next four seasons (1977-93) were designated Phase Two, with work continuing in the Iron Age levels of the acropolis and also extending to the southern EB city wall and associated domestic structures. This volume is primarily devoted to Phase One of the expedition and details background studies and briefer analyses of particular finds during this excavation period.