One important aspect affecting variability in core reduction technology is the degree of expertise of knappers. In the present paper, we show that, at the Middle Palaeolithic open-air site of Nesher Ramla, the degree of expertise of ancient knappers played a major role in shaping the composition of the lithic assemblage. Using robust markers of knapping skill, such as the frequency and reiteration of decision mistakes in the knapping process, allowed us to establish that a clear relationship exists between the degree of structuring of core technologies and the degree of expertise of the knapper at Nesher Ramla. Simple core technologies (e.g. pebble and multiple surface cores) can be linked to the work of novices, while more structured technologies (e.g. Levallois) are linked to the work of more experienced individuals. In addition, we apply for the first time a 3D-based procedure for identifying the causes that possibly lead to knapping accidents, specifically potential errors in the evaluation of the reduction surface exterior platform angle and/or its profile. Tying simple core technologies with the work of unexpert knappers allowed us to explore otherwise elusive social-cultural aspects of past hunter-gatherer societies such as age structuring. Specifically, we suggest that during the most intense phases of occupation in Nesher Ramla, children and/or young adults were present at the site alongside adults.

影响核心还原技术可变性的一个重要方面是敲击者的专业程度。在本文中，我们表明，在内舍尔拉姆拉 (Nesher Ramla) 的旧石器时代中期露天遗址，古代砍刀人的专业程度在塑造石器组合的构成方面发挥了重要作用。使用强大的敲击技能标记，例如敲击过程中决策错误的频率和重复，使我们能够确定核心技术的结构化程度与 Nesher Ramla 的敲击者专业程度之间存在明确的关系。简单的核心技术（例如卵石和多表面核心）可以与新手的工作联系起来，而更结构化的技术（例如Levallois) 与更有经验的人的工作有关。此外，我们首次应用基于 3D 的程序来识别可能导致敲击事故的原因，特别是在评估减少表面外部平台角度和/或其轮廓时的潜在错误。将简单的核心技术与不专业的 knapper 的工作联系起来，使我们能够探索过去狩猎采集社会难以捉摸的社会文化方面，例如年龄结构。具体而言，我们建议在内舍尔拉姆拉占领最激烈的阶段，儿童和/或年轻人与成年人一起出现在现场。