1 Development of transparent payment systems DR IBRAHIM MOTAWA (author for correspondence) Lecturer, School of the Built Environment, Heriot Watt University, UK i.a.motawa@hw.ac.uk PROF AMMAR KAKA Professor, School of the Built Environment, Heriot Watt University, UK a.p.kaka@hw.ac.uk DR CHEE HONG WONG Researcher, School of the Built Environment, Heriot Watt University, UK Keywords: AHP, pricing systems, payment systems, cash flow