Forecasting Method for Estimation of Labor Times in Complex Projects illustrated by a Factory Planning Case Study - Hinrichsen, Sven; Schlick, Christopher Marc; Steiger, Peter; Wurz, Hubert (How business take flight : IIE annual conference and expo 2008, May 17 - 21, The Westin Bayshore, Vancouver, B.C., Canada ; conference proceedings ; [including] 2008 Industrial Engineering Research Conference)