Collaboration

Perhaps collaboration is the same as engagement.

• it is interchangeable with cooperation {Huxham, 1993} and means "something to do with working together". Huxham introduces the concept of "collaborative advantage" to solve problems together
  
• "strong collaborative relationships go hand in hand with good project performance" {NAO, 2006}

Shaffer {Schaffer, 2002: 55} indicates that under the traditional consulting paradigm, consultants do not agree to collaborate. That sounds like avoiding engagement, and engagement is the same as collaboration.

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HUXHAM, C. (1993) Pursuing Collaborative Advantage. The Journal of the Operational Research Society, 44, 599-611.
NAO (2006) Good governance: Measuring Success Through Collaborative Working Relationships. National Audit Office.
SCHAFFER, R. H. (2002) High Impact Consulting, Jossey-Bass.