Abstract
The effectiveness of the application of value stream map** (VSM) highly relies on the analysis of current state map** (CSM) that focuses on identification, evaluation and solution processes of the non-value added (NVA) activities. The conventional application of VSM is performed for these processes using the “effect-based solution” approach. Here, the effects of NVA activities (known as production waste), such as defects, lead time, bottlenecks, etc. are separately identified and evaluated before being related to Lean tools for solution. These tools then recommend ways to eliminate/minimize waste. This conventional approach, however, will lead to unstable solution for long term practice due to its mechanism in targeting the effect as a primary solution rather than the root cause of the effect. In the literature, there are very limited works highlighting these processes in systematic, practical and effective ways. Therefore, this paper introduces a methodology called the VSM-Lean Thinking (VSM-LT) model to improve the analysis of CSM. Then, guides a feasible solution identification before it can be visualized in future state map** (FSM). The key idea behind this VSM-LT model is to identify and evaluate the root cause of the waste as revealed by CSM. The waste is then treated by solving the identified root cause(s) as a primary solution target. The model provides a chain-effect relationship map** platform to identify and evaluate the root cause (s). It can be carried out based on four steps; NVA effect identification, LT-based operation features deficiency matching, possible root cause(s) map** and solution identification & mechanism description. The model is then validated using a case study in a small medium enterprise (SME) of the food-based manufacturing industry. Validation results showed that multiple NVA activities visualized through CSM, come from one similar root cause. Therefore, feasible solution strategies and mechanisms are then recommended. Based on identified root causes, the FSM is then presented to visualize the improvement. Related measures of expected improvement are then compared. In overall, the proposed model is significantly beneficial for VSM practitioners to improve the analysis and evaluation of CSM towards identifying more sustainable solutions for their industry-based operational problems.
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Abbreviations
- VSM:
-
Value stream map**
- CSM:
-
Current state map**
- CT:
-
Cycle time
- D:
-
Defect
- DIRFT:
-
Do it right the first time
- E:
-
Equipment
- FIFO:
-
First in first out
- FSM:
-
Future state map**
- I:
-
Inventory
- JIT:
-
Just in time
- LdT:
-
Loading time
- LT:
-
Lean thinking
- LTi:
-
Lead time
- M:
-
Motion
- NVA:
-
Non value added
- Op:
-
Overproduction
- O-pr:
-
Over-processing
- PA:
-
Production activities
- PIC:
-
Person in charge
- PQ:
-
Product quality
- PT:
-
Processing time
- SME:
-
Small medium enterprise
- SMED:
-
Single minutes exchange of die
- T:
-
Transportation
- TPM:
-
Total productive maintenance
- TPS:
-
Toyota production system
- ULdT:
-
Unloading time
- Uut:
-
Underutilize
- VA:
-
Value added
- W:
-
Worker
- WIP:
-
Work in progress
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Acknowledgements
The authors wish to acknowledge the assistance and encouragement from colleagues, top management and technical staffs of the case study company, especially in providing data and related information to the project. Finally, the authors also thank the referees for their useful suggestions and encouragement.
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Ahmad, R., Amin, R.F.M. & Mustafa, S.A. Value stream map** with lean thinking model for effective non-value added identification, evaluation and solution processes. Oper Manag Res 15, 1490–1509 (2022). https://doi.org/10.1007/s12063-022-00265-9
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DOI: https://doi.org/10.1007/s12063-022-00265-9