Howell and Ballard make no detail available to describe this project's performance, so one cannot be certain of problem
causes and possible solutions. They point out "Fast track project. Schedule main concern. Manpower levels above projected." (p. 73). One can only speculate that uncertainty contributed to occurrence of matching problems, hampering installation work, but apparently successfully overcome. In conclusion, Howell and Ballard recommend that piping backlogs be used to buffer on-site from off-site activity ("successful projects have at least 60% of all pipe on hand when 20% has been installed"), and that the principles of the Last Planner be applied to shield installation from remaining uncertainties.