OMOTAYO, T., OLANIPEKUN, A., OBI, L. and BOATENG, P. 2020. A system thinking approach for incremental reduction of non-physical waste. Built environment project and asset management [online], 10(4): construction 4.0 and circular economy, pages 509-528. Available from: https://doi.org/10.1108/BEPAM-10-2019-0100