Our investigation at Tel Rehov (1) aimed at obtaining reproducible high-quality 14 C dates that could serve as an independent chronological basis (2). Finkelstein and Piasetzky (3) charge that in the results of that study (4) we ignored previously published dates from Tel Rehov (5). We deliberately did not include these dates because of their consistent disparities. The basis for comparison is Locus 2425 of Tel Rehov, which yielded a large heap of charred cereal grains, previously dated by the Weizmann Institute (Rehovot) and University of Arizona 14 C laboratories (5). The average Rehovot date (excluding one outlier in order to pass the chi squared test) (6) was 2699 Ϯ 7 years before the 14 C present (yr B.P.) (Tϭ13.2, 5%ϭ14.1). The average Arizona date for the same cereal grains (5) is 2749 Ϯ 16 yr B.P. (Tϭ7.1, 5%ϭ15.5), a difference of 50 B.P. years. The average of two coherent Groningen dates of the same grains of locus 2425 is 2788 Ϯ 14 yr B.P., about 90 B.P. years older than the Rehovot date. Moreover, other Groningen dates for the end of Stratum V are similar to those for Locus 2425, which amount, altogether, to 12 dates giving (6) an average of 2776 Ϯ 5 yr B.P. (Tϭ8.6, 5%ϭ19.7). As the radiocarbon dating method is pushed to the limit of resolution, which is required for Near Eastern archaeology of the Bronze and Iron Ages (7), comparatively small differences in dating results among individual 14 C labs, which have not previously been too much of an issue in prehistoric context, have become crucial for the periods cited above. The variability of results performed in a single laboratory, under as near identical conditions as possible, constitutes the repeatability (8). The variation in results under widely varying conditions in different laboratories constitutes the reproducibility. Thus, the quality of performance of an individual laboratory can be assessed