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The course of change and transformation of the generations of shipyards shows that the occurrence of an accident or the invention of new technology and advanced machine tools has caused the shipyard to change to the next generation every period. This generation change includes 5 levels so far. The difference between generations of shipyards includes three general parameters of production philosophy, production technology and factory layout. The realization and development of the first generation in the late 1940s, the second generation in the late 1960s, the third generation in the late 1980s, the realization and development of the fourth generation in the early 2000s, and the development of the fifth generation started in 2020. The most important factor in the change of generations of shipbuilding is to achieve the open index (better, cheaoer and sooner). In the research, an overview of important parameters in determining the generation of shipbuilding with advanced machine tools, such as material flow, pre-outfit workshop, block making, factory expansion, mechanization, buffer area, process line, outfitting, and vessel dimensions, have been discussed. 

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The article, by using historical texts, attempts to reconstruct part of the ups and downs of the Caspian Sea’s southern coastal history, the importance of navigation on the shores and ports of the Caspian Sea, and the impact of Nader Shah's policies on the formation and prosperity of navigation in northern Iran. Based on library resources and a thorough analysis of the contents, the article seeks to answer the following questions: 1. What were Nader Shah Afshar's motives and goals in establishing shipping in the Caspian Sea? 2. Why the Russian government was suspicious of this issue? The findings of the study indicate that Nader Shah intended to boost the commercial prosperity of the country by forming a navy in the Caspian Sea and also achieve his political and military goals which were in contrast to the interests of the Russian Tsarist government. Finally, the main purpose of this study is to examine the state of trade, navigation, and shipbuilding during the Nader Shah period, by using the historical approach and archaeological evidence of the shipwreck off the coast of Chamkhaleh in Langarud County which is undoubtedly closely related to the political-military presence of the government and social presence. Hence, the role and position of local rulers of the Caspian Sea coasts and how they interacted with the Afsharid dynasty and foreign companies are noteworthy.