## 5 Discussion  
From the literature review, it was shown that the combination of the two technologies, MID and rapid manufacturing, is a promising approach for the manufacturing of iMMS. However, there is a lack of development processes and tools that would ensure support for the development of iMMS. Furthermore, it could be shown from the literature review that there is also a lack of a systematic approach to context-specific tailoring based on use cases. Based on this literature analysis, a new approach could be examined and developed.  
The findings show that the rule-of-ten cost curve concerns iMMS in particular. Hence, there is a reason to believe that the cost curve is even steeper. It is, therefore, even more important to apply product development methods for iMMS. Past findings show that the development of iMMS requires specialized knowledge. Hence, the use of an engineering tool in the context of iMMS can be of great help in that process. In the following, the research questions (RQ) presented in Section 2 shall be discussed:  
1. \"How can a methodology be developed to tailor a reference process for engineering design that takes into account case studies that are methodologically abstracted and where contextual factors are empirically analyzed?\"
2. \"What are specifically the critical points within the EDP for iMMS?\"  
RQ 1: By asking experts and users for possible use cases and requirements and using [PERSON]'s qualitative content analysis, a new tool to tailor EDP can be developed. This method will make it possible to create product groups based on user cases. These product groups can then be used to build/create an EDP. The product groups consist of contextual factors that are essential and crucial for a new EDP. As a result, this method proves to be useful for an EDP that aims to develop new (types of) products. Yet, there are weaknesses of the method, which shall be mentioned. One of them is the risk of neglecting important contextual factors due to the abstraction process. Furthermore, it can be challenging to find and interview experts. Additionally, while interviewing experts to develop potential use cases, it is important to determine which of the technologies have to be considered. In this study, MID technologies were considered in combination with DMT, resulting in use cases that came into being by the previously mentioned technology, and therefore, it could be not suitable for all iMMS.  
RQ 2: Some critical factors regarding RQ 2 were found. The testing of iMMS requires a great deal of extra effort, and thus, a normal \"design freeze\" cannot be accomplished and consequently should not be included in the available EDP. To make matters worse, customers expect fast processing and high reliability from individualized products. In order to develop products quickly and reliably, product development methods, such as the design for manufacturing, are more important than ever. However, the application of such methods can be time-consuming. Therefore, it is worthwhile to define secured tolerance spaces that have already been tested before an order is placed. An example would be the available pre-knowledge about the maximum and minimum size a person can be in order to produce orthoses.