<![CDATA[Shipbuilding production systems involve complex and interdependent operational activities that require effective coordination between production scheduling and material procurement processes. In hull block fabrication, production delays frequently occur because scheduling activities and material procurement are often managed separately, resulting in material shortages, waiting time, and extended project duration. This study aimed to develop an integrated framework using the Critical Path Method (CPM) and Material Requirement Planning (MRP) to optimize production scheduling and material procurement in hull block fabrication processes. A quantitative approach with a case study design was employed in this research. Data were collected from operational records, including production activity durations, bill of materials, inventory status, supplier lead times, and production schedules. CPM analysis was used to identify critical activities affecting project duration, while MRP analysis was applied to determine material requirements and procurement schedules. The results showed that all production activities belonged to the critical path sequence with a total production duration of 27 days under existing conditions, where the welding process represented the longest activity with a duration of seven days. The proposed integrated framework reduced production lead time from 27 days to 23 days, reduced production delays from four days to one day, decreased waiting time from three days to one day, increased material availability accuracy from 82.4% to 96.2%, and improved on-time completion rate from 85.2% to 95.1%. The findings indicate that integrating CPM and MRP successfully improved production synchronization and operational efficiency in hull block fabrication processes.]]>
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