When I interview I have a list of questions ready, I ask for the candidate to tell me a bit about themselves (a short biography!), a bit about their work history, strengths and weaknesses, treatment likes and dislikes, ambitions and hopes for the future. I short list my favourite candidates based on skill level, experience, personality etc etc and trade test them on 2 trusted friends who I consider great judges of character. 1 older lady and 1 younger lady, and get their feedback on the quality of the treatment (usually massage or pedicure) and how they got on with the candidate. This allows me to see how they communicate with clients of different ages.
HTH :green: