Iris D. Tommelein Associate Member, ASCE,Associate Member, ASCE,PhD Student, Constr. Engrg. and Mgmt. Program, Dept. of Civ. and Envir. Engrg., 215 McLaughlin Hall #1712, Univ. of California, Berkeley, CA 94720. E-mail:
[email protected]. Prof., Constr. Engrg. and Mgmt. Program, Dept. of Civ. and Envir. Engrg., 215 McLaughlin Hall #1712, Univ. of California, Berkeley, CA. E-mail:
[email protected]. at Univ. of Calif., Berkeley, and Res. Dir., Lean Construction Inst., 4536 Fieldbrook Rd., Oakland, CA 94619, E-mail: ballard@ce. berkeley.edu