Software-as-a-service (SaaS) is the leading factor driving system replacements and net new investments in applications. Investment plans for 2014 reveal a significantly increased appetite for SaaS in a broad range of areas, such as enterprise resource planning (ERP), finance, and business intelligence. This Forrester report helps application development and delivery (AD&D) professionals understand the drivers for SaaS adoption and how adoption trends may impact future plans to replace or upgrade current applications.