This whitepaper by Hannah Patterson provides a nice description of Integration Services and the challenges associated with the model. Some of the interesting points are that the SIAM services are enabled by ITIL standards, that governance is key, and that clarity in the retained organization is critical. The strength of the article is the articulation of challenges, especially the challenges associated with changing the internal (retained) organization.

The article doesn’t address some of the other benefits of a SIAM approach, such as increased visibility, the potential for increased accountability and maturity, and enabling the use of tier-2 or tier-3 service providers.