- Budget and schedule constraints are important, and binding, factors
- Regulatory demands create strains and stresses internally
- Selection of solutions is affected by competing internal forces
- There may be significant risk in a decision to switch vendors
- It's often unclear whether one should buy a vendor's solution or build similar capability internally
- Vendors' capabilities may be less polished, and their staffing levels lower, than initially broadcast
- There may be uncertainty regarding vendor commitment to service and on-going maintenance
- There are many choices offered in the marketplace, but often no clearly superior offerings
- Techniques utilized by many vendors are so similar as to appear indistinguishable
- Increasing complexity of solutions has made them difficult to evaluate
- Vendors may be good at 'spin' and representing 'vapor-ware' (tools that don’t yet exist)
- There is a lack of transparency. Some tools are offered as 'black boxes'
- Vendor capabilities and inclinations may be affected by different philosophies and historical evolutionary paths
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