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The factors and conditions that affect the success or failure of information technology (IT) investments are still not well understood. One proxy for measuring success is stock performance. In this paper we explore the contribution of internal business practices, specifically the cost management system used by firms, on the stock price reaction to announcements of IT investments, using event study methodology. In addition, building on resource­based view theory, we look at how a combination of internal and external factors, specifically perceived risk factors and market conditions, impact the stock price reaction.