Hi Paul! I’m glad you enjoyed the article. I would say because this is an adaption of true conjoint analysis, if you are doing a conjoint analysis card without any interview or qualitative-style walk-through, you would want to adhere to the standard n=30 rule, but I’ve had success with far fewer respondents, even 4 or 5, as long as you can have them walk you through their decision making process in an informal interview and glean more qualitative than quantitative feedback. Hope that helps! (More traditional marketing research will often survey hundreds of respondents but that would be for a fully fledged study with part-worth utility scores).