1.Introduction.- 2.Literature Review.- 3.Research Methodology.- 4.The Multi-Stage Multi-Level Decision-Making Model.- 5.Knowledge-Directed opportunistic Search.- 6. The Multi-Agent Based Beam Search Method.- 7. Modeling Complex Decision-Making Problems with the MABBS Methods.- 8.The MABBS Engine.- 9.Industrial Application of the MABBS Method.- 10.Summary and Directions for Future Research.