# Improving a Manufacturing Process Using the 8 Ds Method. A Case Study in a Manufacturing Company
## 5 Conclusions and Industrial Implications
As future work and based on the findings obtained in the present case study, the authors of this research plan to implement the 8 Ds method in some companies from the 914 manufacturing industries located in Baja California state to solve problems related to defective products and/or production process efficiency. Additionally, the authors plan to extend the 8 Ds method implementation, as well as other industrial engineering tools (PDCA cycle, standardized work, poka-yoke, DMAIC, to mention few) not only to companies in the manufacturing sector, but also in another sectors, such as construction, education, agriculture, and food services. Finally, the authors encourage researchers from the industrial engineering field to publish their case studies on the applications of different techniques, methods, or tools, supported by the CRA. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Indicator** & \begin{tabular}{c} **Before Implementing** \\ **the 8 Ds Methodology** \\ \end{tabular} & \
\begin{tabular}{c} **After Implementing the** \\ **8 Ds Methodology** \\ \end{tabular} &
\begin{tabular}{c} **Difference** \\ **Difference** \\ \end{tabular} \\ \hline Total defects & 67 & 16 & \(-\)76.12\% \\ Time for the production process & 7.28 min & 4.61 min & \(-\)36.68\% \\ of part number A & 6.5 min & 4.28 min & \(-\)34.22\% \\ Time for the inspection and & 67 & 0 & \(-\)100\% \\ Machines stoppages & 155 min/day & 35 min/day & \(-\)77.42\% \\ Production & 850 products/day & 1141 product/day & \(+\)34.22\% \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Comparison of the main indicators before and after applying the 8 Ds method. **Author Contributions:** Conceptualization, A.R.-V. and [PERSON]-A.; data curation, A.R.-V. and K.C.A.-S.; formal analysis, J.L.G.-A. and E.J.M. ; funding acquisition, A.R.-V.; investigation, A.R.-V. and K.C.A.-S.; methodology, J.L.G.-A. and E.J.M. ; project administration, A.R.-V. and J.L.G.-A. ; validation, J.L.G.-A. ; visualization, E.J.M. ; writing--original draft, A.R.-V.; writing--review and editing, J.L.G.-A. and E.J.M. All authors have read and agreed to the published version of the manuscript. **Funding:** This research has received no external funding. **Acknowledgments:** The authors would like to acknowledge the manufacturing company where the 8 Ds method was implemented. Additionally, the authors would like to thank the Tijuana Institute of Technology, the Autonomous University of Baja California, the Autonomous University of Ciudad Juarez, and the University of La Rioja for allowing the use of their facilities for this research. Finally, the authors would like to thank CONACYT and PRODEP for their constant support toward develop projects and research. **Conflicts of Interest:** The authors declare that there is no conflict of interest. **Appendix A. Code for the Program on Visual Basic**  
The next step involved introducing the following command:  
Command for the input variable:  
Private Declare Function Inp Lib \"input32.dll\" _  
Alias \"Inp32\" (ByVal PortAddress As Integer) As Integer  
Command for the output variable:  
Private Declare Sub Out Lib \"input32.dll\" _  
Alias \"Out32\" (ByVal PortAddress As Integer, ByVal Value As Integer)  
Command to tell the program that a delay function exists in milliseconds:  
Private Declare Sub Sleep Lib \"kernel32\" (ByVal dwMilliseconds As Long)  
The following instructions are given to the MOTOR TURNS TO THE LEFT button. Private Sub Command2_Click()  
MsgBox (\"BE SURE THAT THE MOTOR IS TURNING COUNTER CLOCKWISE. PRESS OK TO START\")  
Dim x As Integer  
For x = 10 To 500  
Sleep 200  
Out &H378, 6  
Sleep 200  
Out &H378, 5  
Sleep 200  
Out &H378, 9  
Sleep 200  
Out &H378, 10  
Sleep 200  
Next x  
MsgBox (\"END OF TEST TO THE LEFT\")  
End Sub  
Now, instructions are given to the MOTOR TURNS TO THE RIGHT button. Private Sub Command4_Click()  
MsgBox (\"BE SURE THAT THE MOTOR IS TURNING CLOCKWISE.