Resources
This tool, developed by Bob Williams, is based on the Rand Corporation’s Assumption-Based Planning (ABP) method.
Due to most people's inability to work with assumptions, this tool has merged components of ABP and 'force field analysis' approach to overcome this problem.

© Bob Williams
Sources
Williams, B., (n.d.). Assumption based planning tool. Retrieved from: http://www.bobwilliams.co.nz/Tools.html