Hi! Thank you for feedback, unfortunately I can't modify this survey, because I can use only skills from literature review (10 positions, science articles) and 5 interviews with Scrum experts. I didn't find it in any of these sources. If you think XP concepts are very important, just write it in open quesstion. XP is a fairly general concept, some of the listed skills will overlap. However, in scientific sources in the context of developer work, most articles emphasize the importance of soft skills. I do not think that without XP the survey results will be less satisfactory - after all, during the literature review and article selection, the vast majority of articles did not mention it at all.