Field experiments are performed in natural or “real” settings. Field experiments are often conducted in retail environments such as malls or supermarkets. These settings provide a high level of realism. But high levels of realism mean the independent and extraneous variables are difficult to control. Problems with control occur in several ways. For example, conducting a field experiment of a new product in a supermarket requires the retailer’s permission to put the product in the store. Given the large number of new-product introductions each year, retailers are becoming more hesitant about adding new products. Even if the retailer cooperates, proper display and retailer support are needed to conduct the experiment.