# Developing Innovative Crutch Using IDeS (Industrial Design Structure) Methodology
## 3 Case Study
### Design Settings
#### 3.1.1 QFD Method
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline
**Feature** & **1.** & **2.** & **3.** & **4.** & **5.** & **6.** & **7.** & **8.** & **9.** & **10.** & **11.** & **12.** \\ \hline
1. Adaptability & 1 & 0 & 1 & 1 & 2 & 0 & 2 & 1 & 0 & 1 & 0 & 0 \\ \hline
2. Adjustability & 2 & 1 & 2 & 0 & 2 & 1 & 2 & 1 & 0 & 2 & 0 & 0 \\ \hline
3. Lightness & 1 & 0 & 1 & 1 & 2 & 0 & 1 & 2 & 0 & 0 & 0 & 2 \\ \hline
4. Ergonomics & 1 & 2 & 1 & 1 & 2 & 0 & 1 & 0 & 0 & 0 & 0 & 1 \\ \hline
5. Reliability & 0 & 0 & 0 & 0 & 1 & 0 & 1 & 1 & 0 & 0 & 0 & 0 \\ \hline
6. Hygiene & 2 & 1 & 2 & 2 & 2 & 1 & 2 & 2 & 0 & 1 & 0 & 1 \\ \hline
7. Material Strength & 0 & 0 & 1 & 1 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 1 \\ \hline
8. Durability & 1 & 1 & 0 & 2 & 1 & 0 & 1 & 1 & 0 & 1 & 0 & 1 \\ \hline
9. Affordance & 2 & 2 & 2 & 2 & 2 & 2 & 2 & 1 & 1 & 0 & 2 \\ \hline
10. Dimensions & 1 & 0 & 2 & 2 & 2 & 1 & 1 & 1 & 1 & 1 & 1 & 2 \\ \hline
11. Appearance & 2 & 2 & 2 & 2 & 2 & 2 & 2 & 2 & 2 & 1 & 1 & 2 \\ \hline
12. Comfort of use & 2 & 2 & 0 & 1 & 2 & 1 & 1 & 1 & 0 & 0 & 0 & 1 \\ \hline
**Total** & **15** & **11** & **14** & **15** & **21** & **8** & **17** & **15** & **4** & **9** & **2** & **13** \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Relationship Matrix: Relative Importance. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**Feature** & **1.** & **2.** & **3.** & **4.** & **5.** & **6.** & **7.** & **8.** & **9.** & **10.** & **11.** & **12.** & **Total** \\ \hline
1. Adaptability & & 0 & 1 & 1 & 9 & 0 & 1 & 1 & 0 & 1 & 0 & 3 & **17** \\ \hline
2. Adjustability & 0 & & 0 & 0 & 1 & 0 & 1 & 3 & 0 & 1 & 1 & 3 & **16** \\ \hline
3. Lightness & 3 & 3 & & 0 & 3 & 0 & 3 & 1 & 1 & 3 & 1 & 3 & **21** \\ \hline
4. Ergonomics & 3 & 1 & 1 & 1 & 1 & 0 & 3 & 3 & 1 & 0 & 3 & **17** \\ \hline
5. Reliability & 3 & 1 & 3 & 0 & 0 & 9 & 0 & 0 & 1 & 0 & 3 & **20** \\ \hline
6. Hygiene & 1 & 0 & 0 & 1 & 0 & 0 & 3 & 0 & 3 & 1 & 0 & **9** \\ \hline
7. Material Strength & 9 & 3 & 3 & 0 & 3 & 0 & 3 & 0 & 1 & 1 & 0 & **23** \\ \hline
8. Durability & 3 & 1 & 3 & 3 & 3 & 1 & 9 & 0 & 1 & 0 & 3 & **27** \\ \hline
9. Affordance & 0 & 3 & 0 & 1 & 0 & 0 & 0 & 0 & 1 & 9 & 0 & **14** \\ \hline
10. Dimensions & 3 & 9 & 3 & 1 & 1 & 1 & 0 & 1 & 1 & & 3 & 1 & **24** \\ \hline
11. Appearance & 0 & 3 & 0 & 3 & 0 & 1 & 0 & 0 & 9 & 3 & & 0 & **19** \\ \hline
12. Comfort of use & 3 & 0 & 1 & 3 & 1 & 0 & 0 & 3 & 0 & 1 & 0 & & **12** \\ \hline
**Total** & **28** & **24** & **15** & **13** & **22** & **4** & **23** & **18** & **14** & **17** & **16** & **19** \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Relationship Matrix: Dependence/Independence. * Ergonomics
* Durability
* Adjustability  
At the same time, in order to identify the most important and interesting features that can be implemented in the crutch with the use of sensors, there have been planned a few brainstorming sessions among the components of the team. Then, these features were placed into the Relationship Matrix of Relative Importance (Table 3) to define the most important ones, assigning the scores using the method already explained. By calculating the sum of all the values in each column, there was obtained a ranking of the most important features that have to be implemented, usage monitoring and fall alarm.