Here’s a couple of resources addressing the different methods to measure street connectivity.  I think I have hardcopies of these, let me know if you can’t find them and I will scan and email them to you.

Criterion Planners Engineers (October 2001) INDEX PlanBuilder Users Guide, Portland, OR.

Ewing, R. (1996) Best Development Practices: Doing the Right Thing and Making Money at the Same Time,

American Planning Association, Chicago, IL.

Handy, S., Butler, K. and Paterson, R. G. (2003) Planning for Street Connectivity - Getting from Here to There,

American Planning Association, Chicago.

Randall, T. A. and Baetz, B. W. (2001) Evaluating Pedestrian Connectivity for Suburban Sustainability. Journal of

Urban Planning and Development, 127, 1-15.

 From: Mike Zimney Lead GIS Analyst / Planner