There were some surprises in the skills groupings, such as education, languages and art skills being grouped together with marketing, design and sales. It is likely that this is explained by the connection between teaching foreign languages and using them in sales roles. Medical device sales skills were also assigned to a health related group rather than to a sales cluster. This may reflect that a certain level of clinical experience is required in medical sales jobs. 
To facilitate the exploration of the skills hierarchy, a prototype interactive data visualisation was developed (Figure \ref{366334}\ref{749565}). The visualisation shows the three layers of the hierarchy but not the underlying individual skills. In the visualisation we also provide a brief description of each cluster, including average salary, the top five skills, the most common job titles and the proportion of unique job adverts that mention skills in the cluster.