Always, always do a consultation card, I do one at first appointment asking about life style, possible contra-indications, etc. Then I update at each appointment with date, treatment provided, colour chosen, any art/glitter/stamping brief description, and a one - line description of any observations such as great condition, dry cuticles, no issues, etc. It's come in useful many many times in remembering specific colours chosen before, and even help with medical issues.
I fill it in whilst clients polish is drying, or they're getting their purse, etc. They know I'm doing it and why so happily wait until I'm done if they are quicker then me.
Client record card kept with their individual abrasives in my filing cabinet
