1. Senior Lecturer, Dept. of Mechanical, Aerospace, and Civil Engineering, Univ. of Manchester, Manchester M13 9PL, UK (corresponding author). ORCID: .
2. Professor Emeritus, Dept. of Construction Economics and Management, Univ. of Cape Town, Private Bag, Rondebosch, Cape Town 7701, South Africa.
3. Professor, Dept. of Construction Economics and Management, Univ. of Cape Town, Private Bag, Rondebosch, Cape Town 7701, South Africa.
4. Adjunct Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, 1173 Glenn L. Martin Hall, 4298 Campus Dr., College Park, MD 20742.