It strongly depends on what product features the producer wants to establish via such surveys. If there is some specific design utility the rct would be the preliminaty survey before trial-and-error. The second one can approve the real market response.

Thank you Nickolay and Milan for your thought-provoking discussions and insights.

My response to this question is which approach would be more appropriate rather than which one will be more successful in developing an innovative product. It has been proven that much innovation emerges from trial and error but one must always leverage the cost involved in making the decision to select an approach.

Both not because both inmy views do not qualify as systematic scientfic methods Product development is continuous develoment process Old products signal the chages with reference to demand supplying capacity and quality Please clear yourself about the process of innovation