Disparities may exist between memory elements (such as knowledge and information) embedded in an organization’s ERP package and related memory elements located in other organizational memory media. This paper presents the Systematic Analysis Method of Memory Mismatches (SAMMM). Three types of such disparities, called memory mismatches here, have been observed by applying SAMMM to the usage stage of ERP systems. Because SAMMM includes the analysis of causes of memory mismatches, it can be used as a starting point for improving ERP performance. Additional research may focus on the enhancement and application of SAMMM combined with coping methods.