User Study to Evaluate the Usability of Variability in 4diac (V4rdiac) - Workshop and Interview Script

The authors use the following artifacts for evaluating the usability of Variability for 4diac (V4rdiac) approach. 

During this evaluation, the authors used the following artifacts:

1. Delta Modeling Cheatsheet: This artifact describes syntax and examples of how to write a delta model and an application condition in the V4rdiac approach. 
2. Interview Script: This artifact describes a set of interview questions used as a guideline to evaluate the usability of V4rdiac approach. 
3. Workshop Script: This artifact describes a workshop scenario to be followed by the participants in our user study.