The Problem of Inaccurate Production Time Estimation

Oct 13, 2025 by wbrum.org 15 views

Introduction

PT Sarana Bersama Sejahtera (PT SBS) is a company that specializes in producing industrial machinery components and iron molds, including prints for the wood, plastic, and iron industries. One of the mainstay products of this company is a radial cutting knife produced based on order (make to order). However, despite having production standards, companies often experience a discrepancy between the expected product completion time and what actually occurs on the factory floor. This is caused by work procedures in making radial cut knives that have not been fully standardized.

The Problem of Inaccurate Production Time Estimation

The main problem faced by PT SBS is the difference between the actual settlement time and the estimated time that has been set. Without a clear method as a reference in determining production time, the company has difficulty managing customer expectations. To overcome this problem, the authors propose the application of the GERT (Graphical Evaluation and Review Technique) method as a step to determine the more accurate making time.

Understanding the GERT Method

The GERT method is a powerful tool for analyzing and modeling complex systems, including production processes. It allows the company to analyze the process of completion of the process by considering factors such as the speed of production per unit time and the probability of the occurrence of activities that may require re-work. In the context of PT SBS, the required data includes the completion time of each process and the number of failures, both the product that is rejected and rejecting.

The Application of the GERT Method in PT SBS

The process of calculating the GERT will produce a topological equation needed to determine the average time (μ) and variance (σ²) of production. Based on the results of the study, it is known that each process in the network of radial cut knives is dependent, while the probability of each activity is mutually exclusive. By applying the GERT formula obtained, the average time of making a radial cut knife is 91,0872 minutes, or equivalent to 1,5182 hours. In addition, the resulting variance is 38,9779 minutes.

The Results of the Study

In other words, to complete a radial cut knife order, it takes about 152 hours of work. Meanwhile, the estimated time estimated by the company reaches 23 working days, or around 161 working hours. Thus, the application of the GERT method not only helps PT SBS in optimizing the production process, but also provides a more realistic picture related to the product completion time.

Conclusion

The results of this analysis are expected to be the basis for management to improve existing work procedures, increase production efficiency, and ultimately, increase customer satisfaction. Through a data-based approach and systematic analysis, PT SBS can be better in planning and implementing production that meets consumer expectations. In the future, it is important for companies to continue to monitor and evaluate the production process and apply more sophisticated methods in planning to reduce the uncertainty of product completion.

Recommendations

Continuously Monitor and Evaluate the Production Process: Companies should continue to monitor and evaluate the production process to identify areas for improvement and optimize production efficiency.
Apply More Sophisticated Methods in Planning: Companies should apply more sophisticated methods in planning to reduce the uncertainty of product completion and meet market demand.
Improve Existing Work Procedures: Companies should improve existing work procedures to increase production efficiency and customer satisfaction.

Future Research Directions

Development of a More Advanced GERT Model: Future research can focus on developing a more advanced GERT model that can handle more complex production processes and provide more accurate results.
Application of the GERT Method in Other Industries: Future research can focus on applying the GERT method in other industries to optimize production processes and improve customer satisfaction.
Development of a Decision Support System: Future research can focus on developing a decision support system that can help companies make informed decisions about production planning and optimization.
Frequently Asked Questions (FAQs) about the Application of the GERT Method in Determining the Completion Time Production Process at PT Sarana Bersama Sejahtera ===========================================================

Q: What is the GERT method and how does it work?

A: The GERT method is a powerful tool for analyzing and modeling complex systems, including production processes. It allows the company to analyze the process of completion of the process by considering factors such as the speed of production per unit time and the probability of the occurrence of activities that may require re-work.

Q: What are the benefits of using the GERT method in production planning?

A: The GERT method provides a more accurate and realistic picture of the production process, which can help companies optimize production efficiency and customer satisfaction. It also allows companies to identify areas for improvement and make informed decisions about production planning.

Q: How does the GERT method help companies manage customer expectations?

A: The GERT method helps companies manage customer expectations by providing a more accurate estimate of production time. This can help companies meet customer demands and improve customer satisfaction.

Q: What are the limitations of the GERT method?

A: The GERT method is a complex tool that requires specialized knowledge and expertise to use effectively. It may also require significant data collection and analysis, which can be time-consuming and resource-intensive.

Q: Can the GERT method be applied to other industries?

A: Yes, the GERT method can be applied to other industries to optimize production processes and improve customer satisfaction. However, the specific application and implementation of the GERT method may vary depending on the industry and company.

Q: What are the future research directions for the GERT method?

A: Future research directions for the GERT method include developing a more advanced GERT model that can handle more complex production processes and provide more accurate results. Additionally, researchers can explore the application of the GERT method in other industries and develop a decision support system to help companies make informed decisions about production planning and optimization.

Q: How can companies implement the GERT method in their production planning?

A: Companies can implement the GERT method in their production planning by collecting and analyzing data on production processes, identifying areas for improvement, and using the GERT method to optimize production efficiency and customer satisfaction.

Q: What are the key takeaways from the application of the GERT method in PT Sarana Bersama Sejahtera?

A: The key takeaways from the application of the GERT method in PT Sarana Bersama Sejahtera include the importance of using a data-based approach and systematic analysis to optimize production efficiency and customer satisfaction. Additionally, the study highlights the need for companies to continuously monitor and evaluate the production process and apply more sophisticated methods in planning to reduce the uncertainty of product completion.

Q: What are the implications of the study for the manufacturing industry?

A: The study has implications for the manufacturing industry in terms of the need for companies to optimize production efficiency and customer satisfaction. It also highlights the importance of using data-based approaches and systematic analysis to make informed decisions about production planning and optimization.