“…Blackburn and Millen (1980), Chand (1982), Bookbinder and H'ng (1986a), Ristroph (1990), Sridharan and Berry (1990b), Stadtler (2000) and Simpson (2001) evaluate different lot-sizing rules in uncapacitated, single-level MRP systems with deterministic demand, whereas DeBodt and Wassenhove (1983), Wemmerlov and Whybark (1984), Bookbinder and H'ng (1986b) examine a single-level stochastic demand environment. Millen (1982a, 1982b), Zhao et al (1995), Zhao and Lee (1996), Zhao and Lam (1997) and Simpson (1999) study lot-sizing in deterministic demand multi-level MRP systems, while Zhao et al (1995) consider stochastic demand.…”