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The Oldowan technology has traditionally been assumed to reflect technical simplicity and limited planning by Plio-Pleistocene hominids. The analysis of the Oldowan technology from a set of 1.6-1.4 Ma sites (ST Site Complex) in Peninj adds new information regarding the curated behavior of early hominids. The present work introduces new data to the few published monographic works on East African Oldowan technology. Its relevance lies in its conclusions, since the Peninj Oldowan assemblages show complex technological skills for Lower Pleistocene hominids, which are more complex than has been previously inferred for the Oldowan stone tool industry. Reduced variability of tool types and complex use of cores for flaking are some of the most remarkable features that identify the Oldowan assemblages from Peninj. Hominids during this period seem to have already been experimenting with pre-determination of the flaked products from cores, a feature presently assumed to appear later in time. Planning and template structuring of flaked products are integral parts of the Oldowan at Peninj.