Chains, Ropes, and Slings Test II Source: Questions and answers from the National Safety Council Progress Indicator: Question 6 of 22 6.  Systematic exploration requires a team to tie all crosscuts together before advancing (the 2 + 3 rule) mainly to? Choices: Insure the accuracy of a team’s map. Prevent a team from advancing past areas where survivors could have sought refuge. Prevent a team from advancing forward of an unexplored area. b & c.