This article will address the use of "mode of operation" theory in so-called negligent stacking cases against retailers for premises liability. Adding mode of operation analysis into the mix creates new considerations for retailers in defense of cases of falling merchandise. While many courts look solely to the method of stacking standing on its own in making this determination, some have introduced the concept of mode of operation into the analysis. By introducing this consideration, courts invite inquiry into the reasonably foreseeable interference of customers. Being on the lookout for this issue is important early in the pleading process as well as during the presentation of evidence at trial.