Strategic business planning is a critical decision problem determining the long-term survival and prosperity of companies especially in this E-era. However, due to the dynamic and complicated nature of the e-business environment and decision makers? lack of technological sophistication, the development of e-business strategies constitutes a major challenge for managers. In an ongoing project, we have been focusing on DMSS development and its role in decision support for e-business planning. An E-business planning model was estimated and developed using empirical eBay data. This current study thus aims to reestimate and evaluate such implementation to further broaden the application base in a practical field setting.