As more sourcing executives consider incorporating SaaS solutions into their overall technology vendor landscape, the potential to significantly disrupt the current software market grows. And while SaaS adoption is expected to expand in the coming years, the challenge for sourcing professionals will be a lack of uniform adoption across the whole software market. In some software categories, SaaS will be a disruptive technology, in others the only option, and in many cases SaaS will have minimal impact.

Overall, SaaS will more than double from 7 percent of software investment in 2010 to 16 percent in 2013, so it's not surprising that many of the assessed product categories will change to have a greater or smaller number of SaaS solutions during that time.

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