Abstract
In this paper, I intend to enable you to understand and adapt Monte-Carlo Simulation to your project practically. First I explain Monte-Carlo Simulation with "Riskology" which is a simple tool to execute Monte-Carlo Simulation on your PC, developed by DeMacro and Lister. Second I prove how it explains period and cost of actual projects well by comparing to actual data collected and published by SEC (Software Engineering Center). As a result, I found both of them have similar probability distribution and I believe it could be useful to treat risks in real projects.
