1. Improving the Collaboration between Main Contractors and Subcontractors within Traditional Construction Procurement
2. Construction Management: Traditional versus Bureaucratic Methods
3. Issues in Subcontracting Practice
4. Ballard G.(2005) “Construction: one type of project production system.” In: Proceedings IGLC‐13 July Sydney Australia.
5. Ballard G.andHowell G.A.(1998) “What kind of production is construction?” In:Proceedings 6th Annual Lean Construction Conference (IGLC‐6) 13–15 August 1998 Guarujá Brazil.