Abstract
ERP Forum Japan has been surveying for computerized level of Core Business Systems by asking users since late of 1990s. We have noticed there are following changes in the way of systemization for core business system execution. There are big change from in-house development to usage of package S/W in the past decade. ERP Package has been used highly among various packaged S/W. We have learned several drivers to shift from in-house development to usage of package S/W for core business systems through interviewing for leading users asking about the ways to develop core business systems to contribute enterprise management. This paper reports the result of relationship of core business system satisfaction affected by the ways of core business systems execution.