Considering the implementability and usability of the categor- ization, the number of factors that will be used in the framework should be carefully selected. In addition to the selected ones, other factors such as supply variance, demand area, product life- cycle, part criticality and demand region (installed equipment in a geographical area) were considered as candidates for categoriza- tion in the case company, but were not included in the final framework. While determining the factors, data availability should be noticed as it may restrict the usage of some factors that would otherwise be considered essential. It should also be considered whether to use qualitative or quantitative values in the categorization. For example in the case company, only qualitative data was considered reliable in the supply categoriza- tion. On the other hand in the demand link categorization reliable quantitative data were available and the company saw faster improvement possibilities as majority of the customers were internal.