This research aims to study the production process and improve the production efficiency of a precast concrete floor company in Pathum Thani province, Thailand. The research seeks to help the company improve and enhance its production efficiency by using Pareto charts to identify problems and employing a Why-Why analysis to determine the root causes. The ECRS principle is then applied to address the identified issues and facilitate process improvement. Based on the current research, the main problems identified are as follows:  production efficiency is not reaching its full potential with an average production rate of 26,460.22 square meters, employee health is affected by work fatigue due to long working hours, averaging 10.95 hours per day, and Labor costs amount to an average of 231,841.90 baht per month. After implementing the ECRS and modifying the work procedures, the research indicates that the production efficiency has improved, with an average monthly production rate of 29,973.82 square meters. Additionally, the average daily working hours have decreased by 7.78 hours, and labor costs have been reduced to 199,825.50 baht per month. The percentages are as follows: 1) Production efficiency increased by 10.88%, 2) Working time decreased by 19.67%, and 3) labor cost decreased by 13.80%.

Keywords

Precast concrete slabs, the Pareto chart, ECRS: Eliminate, Combine, Rearrange and

Simplify, Fishbone diagram.