When then have an Audio Recording Mystery Visits. Similar to the previous traditional method, however, there is the added aspect of the Audio Recording. So for example, if the shopper is evaluating a specific staff on the product knowledge. The shopper is then required to record the conversation between him/herself and the staff involve.
This evaluation process is slightly more difficult. As you can imagine, secretly trying to record someone is not easy. Let alone, trying to record in a busy environment. What makes these visits hard, is getting that clear audio recording.
Now, this kind of Mystery Visit still requires the trust of the shopper. It also requires the shopper to be tactful and cautious.