Perceptions of Public-Private Partnerships Transportation Project Success Factors in Developing Countries: An Explanatory Sequential Investigation
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Abstract
Inadequate transportation infrastructure is a significant obstacle to any economy’s growth and development potential. A primary challenge to sustainable delivery is finance. Concerns about the efficacy of innovative mechanisms for financing infrastructure investments, primarily through public-private partnerships (PPPs), abound in the literature and practice. Few studies focus on the critical success factors (CSFs) for PPPs transport projects in emerging markets. This study aims to identify the taxonomy and manifestations of CSFs associated with executing PPP-based transportation projects in developing countries. The study collected and analysed data using a questionnaire and in-depth interviews using a mixed-methods sequential explanatory investigation among built environment professionals, including general contractors, consultants and government agencies. Findings indicated that good governance, the project’s technical feasibility, the commitment of the public and private partners, appropriate risk allocation and sharing and experience were the most critical success factors. Multivariate techniques using factor analysis identified four principal components: partnership and procurement, economic and governance technical factors and political and social factors. The study contributes to the body of knowledge using mixed methods within an underexplored context: developing countries. The findings could be extended further using more robust statistical techniques. The localisation conditions for the effective delivery of transportation projects should be considered.
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References
Ahmadabadi, A.A. and Heravi, G. (2019). The effect of critical success factors on project success in public-private partnership projects: A case study of highway projects in Iran. Transport Policy, 73: 152–161. https://doi.org/10.1016/j.tranpol.2018.07.004
Almarri, K. and Boussabaine, H. (2017). The influence of critical success factors on value for money viability analysis in public-private partnership projects. Project Management Journal, 48(4): 93–106. https://doi.org/10.1177/875697281704800408
Al-Saadi, R. and Abdou, A. (2016). Factors critical for the success of public-private partnerships in UAE infrastructure projects: Experts’ perception. International Journal Construction Management, 16(3): 234–248. https://doi.org/10.1080/15623599.2016.1146110
Babatunde, S.O. and Perera, S. (2017). Cross-sectional comparison of public-private partnerships in transport infrastructure development in Nigeria. Engineering, Construction and Architectural Management, 24(6): 875–900. https://doi.org/10.1108/ECAM-11-2015-0186
Babatunde, S.O., Opawole, A. and Ujaddughe, I.C. (2010). An appraisal of project procurement methods in the Nigerian construction industry. Civil Engineering Dimension, 12(1): 1–7.
Babatunde, S.O., Perera, S., Udeaja, C. and Zhou, L. (2014). Identification of barriers to public-private partnerships implementation in developing countries. Paper presented at the International Conference on Construction in Changing World. Sri Lanka, 4–7 May.
Bae, Y. and Joo, Y.M. (2016). Pathways to meet critical success factors for local PPPs: The cases of urban transport infrastructure in Korean cities. Cities, 53: 35–42. https://doi.org/10.1016/j.cities.2016.01.007
Benítez-Ávila, C., Hartmann, A. and Dewulf, G. (2019). Contractual and relational governance as positioned-practices in ongoing public-private partnership projects. Project Management Journal, 50(6): 1–18. https://doi.org/10.1177/8756972819848224
Bowen, P., Rose, R. and Pilkington, A. (2017). Mixed methods: Theory and practice; Sequential, explanatory approach. International Journal of Quantitative and Qualitative Research Methods, 5(2): 10–27.
Braun, V. and Clarke, V. (2020). Can I use TA? Should I use TA? Should I not use TA? Comparing reflexive thematic analysis and other pattern-based qualitative analytic approaches. Counselling and Psychotherapy Research, 21(1): 37–47. https://doi.org/10.1002/capr.12360
Brown, J.R. and Dant, R.P. (2008). On what makes a significant contribution to the retailing literature. Journal of Retailing, 84(2): 131–135. https://doi.org/10.1016/j.jretai.2008.05.002
Chan, D.W.M., Sarvari, H., Husein, A.A.J.A., Awadh, K.M., Golestanizadeh, M. and Cristofaro, M. (2023). Barriers to attracting private sector investment in public road infrastructure projects in the developing country of Iran. Sustainability, 15(2): 1–26. https://doi.org/10.3390/su15021452
Cherkos, F.D. and Jha, K.N. (2021). Drivers of road sector public-private partnership adoption in new and inexperienced markets. Journal of Construction Engineering and Management, 147(3): 04020186. https://doi.org/10.1061/(ASCE)CO.1943-7862.0002004
Chileshe, N. and Kavishe, N. (2020). Regulatory process for infrastructure systems development. In E. Ochieng, T. Zuofa and S. Bad (eds.), Routledge Handbook of Planning and Management of Global Strategic Infrastructure Projects. London: Routledge, 1–35. https://doi.org/10.1201/9781003036388-12
Chileshe, N., Njau, C.W., Kibichii, B.K, Macharia, L.N. and Kavishe, N. (2022). Critical success factors for public-private partnership (PPP) infrastructure and housing projects in Kenya. International Journal of Construction Management, 22(9): 1606–1617. https://doi.org/10.1080/15623599.2020.1736835
Dale, P., Sporne, I., Knight, J., Sheaves, M., Eslami-Andergoli, L. and Dwyer, P. (2019). A conceptual model to improve links between science, policy and practice in coastal management. Marine Policy, 103: 42–49. https://doi.org/10.1016/j.marpol.2019.02.029
Damoah C.M. and Asamoah K. (2021). Public-private partnerships for improved service delivery: the case of Intercity STC coaches in Ghana. Development Practice, 31(1): 1–10. https://doi.org/10.1080/09614524.2020.1757623
Damoah, I.S., Ayakwah, A. and Twum, P. (2022). Assessing public sector road construction projects’ critical success factors in a developing economy: Definitive stakeholders’ perspective. Journal of Project Management, 7: 23–34. https://doi.org/10.5267/j.jpm.2021.7.003
Day, J.K. and Gunderson, D.E. (2018). Mixed methods in built environment research. Paper presented at the Proceedings of the 54th ASC Annual International Conference. Texas, America, 22–25 April.
Debela, G.Y. (2019). Critical success factors (CSF) of public-private partnership (PPP) road projects in Ethiopia. International Journal of Construction Management, 22(3): 489–500. https://doi.org/10.1080/15623599.2019.1634667
Draucker, C.B., Rawl, S.M., Vode, E. and Carter-Harris, L. (2020). Integration through connecting in explanatory sequential mixed method studies. Western Journal of Nursing Research, 42(12): 1137–1147. https://doi.org/10.1177/0193945920914647
Ebert, J.F., Huibers, L., Christensen, B. and Christensen, M.B. (2018). Paper- or web-based questionnaire invitations as a method for data collection: Cross-sectional comparative study of differences in response rate, completeness of data and financial cost. Journal of Medical Internet Research, 20(1): 1–13. https://doi.org/10.2196/jmir.8353
EY (Ernst and Young) (2015). Public-private partnerships and the global infrastructure challenge. Available at: http://www.fa.ru/org/chair/gchp/Documents/biblio/EY-public-private-partnerships-and-the-global.pdf [Accessed on 18 December 2021].
Farrugia, P., Petrisor, B.A., Farrokhyar, F. and Bhandari, M. (2010). Research questions, hypotheses and objectives. Canadian Journal of Surgery, 53(4): 278–281.
Field, A. (2013). Discovering Statistics Using IBM SPSS Statistics. 4th Ed. Thousand Oaks, CA: Sage.
Firmino, S.I. (2018). Critical success factors of public-private partnerships: Political and institutional aspects. Case study of highways in Portugal. Brazilian Journal of Public Administration, 52(6): 1270–1281. https://doi.org/10.1590/0034-761220170228
Fombad, M.C. (2013). Accountability challenges in public-private partnerships from a South African perspective. African Journal of Business Ethics, 7(1): 11–25. https://doi.org/10.4103/1817-7417.119954
Fouad, M., Matsumoto, C., Monteiro, R., Rial, I. and Sakrak, O.A. (2021). Mastering the Risky Business of Public-Private Partnerships in Infrastructure. Washington: International Monetary Fund.
Gaskin, C.J. and Happell, B. (2013). On exploratory factor analysis: A review of recent evidence, an assessment of current practice and recommendations for future use. International Journal of Nursing Studies, 51(3): 511–521. https://doi.org/10.1016/j.ijnurstu.2013.10.005
George, A., Kaldany, R. and Losavio, J. (2019). The world is facing a $15 trillion infrastructure gap by 2040. Here’s how to bridge it. Available at: https://www.weforum.org/agenda/2019/04/infrastructure-gap-heres-how-to-solve-it/?DAG=3&gclid=Cj0KCQjwzdOlBhCNARIsAPMwjbxQV_lLlCVbOw7C0U3M XvBpv40mse895l4Ugbw9KSDy-SzYFdI1cm8aAs1JEALw_wcB [Accessed on 18 December 2021].
Gibson, K. (2020). Bridging the digital divide: Reflections on using WhatsApp instant messenger interviews in youth research. Qualitative Research in Psychology, 19(3): 611–631. https://doi.org/10.1080/14780887.2020.1751902
González-Medrano, M. and Martín, T.G. (2021). Analysis of public-private partnership models in high-speed railway transport in Portugal. Transportation Research Procedia, 58: 29–36. https://doi.org/10.1016/j.trpro.2021.11.005
Habiyaremye, A., King, N.A. and Tregenna, F. (2022). Innovation and socio-economic development challenges in South Africa: An overview of indicators and trends. SARChI industrial development working paper series. Available at: https://www.uj.ac.za/wp-content/uploads/2021/10/sarchi-wp-2022-03-habiyaremye-king-tregenna-march-2022.pdf [Accessed on 24 February 2023].
Hadi, N.U., Abdullah, N. and Sentosa, I. (2016). An easy approach to exploratory factor analysis: Marketing perspective. Journal of Educational and Social Research, 6(1): 215–223. https://doi.org/10.5901/jesr.2016.v6n1p215
Hair, J.F., Black, W.C., Babin, B.J. and Anderson, R.E. (2019). Multivariate Data Analysis: A Global Perspective. 8th Ed. Hampshire, UK: Cengage.
. (2014). Multivariate Data Analysis. 7th Ed. Upper Saddle River, NJ: Pearson. Heyns, G. and Luke, R. (2017). Importance of transport infrastructure for socio-
economic development: a South African public opinion survey. Paper presented at the 4th International on Development and and Investment in Infrastructure Conference. Livingstone, Zambia, 30 August–1 September.
Hwang, B.G., Zhao, X. and Gay, M.J.S. (2013). Public private partnership projects in Singapore: Factors, critical risks and preferred risk allocation from the perspective of contractors. International Journal Project Management, 31(3): 424–433. https://doi.org/10.1016/j.ijproman.2012.08.003
Jiang, L., Wen, H. and Qi, W. (2020). Sizing up transport poverty alleviation: A structural equation modeling empirical analysis. Journal Advanced Transportation, 1–13. https://doi.org/10.1155/2020/8835514
Kavishe, N. and Chileshe, N. (2019). Critical success factors in public-private partnerships (PPPs) on affordable housing schemes delivery in Tanzania: A qualitative study. Journal of Facilities Management, 17(2): 188–207. https://doi.org/10.1108/JFM-05-2018-0033
Ke, Y., Hao, W., Ding, H. and Wang, Y. (2017). Factors influencing the private involvement in urban rail public-private partnership projects in China. Construction Economics and Building, 17(1): 90–106. https://doi.org/10.5130/ AJCEB.v17i1.5105
Kirchherr, J. and Charles, K. (2018). Enhancing the sample diversity of snowball samples: Recommendations from a research project on anti-dam movements in Southeast Asia. PLoS ONE, 13(8): 1–17. https://doi.org/10.1371/journal.pone.0201710
Knekta, E., Runyon, C. and Eddy, S. (2018). One size doesn’t fit all: Using factor analysis to gather validity evidence when using surveys in your research. CBE – Life Sciences Education, 18(1): 1–17. https://doi.org/10.1187/cbe.18-04-0064
Li, B., Akintoye, A., Edwards, P.J. and Hardcastle, C. (2005). Critical success factors for PPP/PFI projects in the UK construction industry. Construction Management Economics, 23(5): 459–471. https://doi.org/10.1080/01446190500041537
Liang, Y. and Wang, H. (2019). Sustainable performance measurements for public–private partnership projects: Empirical evidence from China. Sustainability, 11(13): 1–15. https://doi.org/10.3390/su11133653
Likhitruangsilp, V., Do, S.T., Onishi, M. and Tran, T.T.D. (2018). Analyzing problems affecting the performances of public-private partnership transportation projects: Case studies in Vietnam. Songklanakarin Journal of Science and Technology, 40(6): 1405–1419. https://doi.org/10.14456/sjst-psu.2018.172
Liu, J., Love, P.E.D., Smith, J., Regan, M., Davis, P.R. (2015). Life cycle critical success factors for public-private partnership infrastructure projects. Journal of Management in Engineering, 31(5): 1–7. https://doi.org/10.1061/(ASCE) ME.1943-5479.0000307
Malek, M.S. and Bhatt, V. (2023). Examine the comparison of CSFs for public and private sector’s stakeholders: A SEM approach towards PPP in Indian road sector. International Journal of Construction Management, 23(13): 2239–2248. https://doi.org/10.1080/15623599.2022.2049490
Manu, P., Asiedu, R.O., Mahamadu, A.M., Olomolaiye, P.O., Booth, C., Manu, E., Ajayi, S. and Agyekum, K. (2021). Contribution of procurement capacity of public agencies to attainment of procurement objectives in infrastructure procurement. Engineering, Construction and Architectural Management, 28(10): 3322–3345. https://doi.org/10.1108/ECAM-05-2020-0375
Matsiliza, N.S. (2016). Critical factors in respect of managing the e-toll road project in Gauteng, South Africa. African Journal of Hospitality, Tourism and Leisure, 5(1): 1–11.
Matta, R. and Panchal, N. (2020). Effect of critical success factors of pre-construction and construction on critical success factors of operation in PPP highway project: A structural equation modeling approach. International Journal of Advanced Science and Technology, 29(1): 1604–1616.
Menzies, I. (2016). Delivering Universal and Sustainable Water Service:s Partnering with the Private Sector; Guidance Note. Washington DC: World Bank. https://doi.org/10.1596/K8693
Ministry of Finance and Development Planning (MFDP) (2009). Public-Private Partnership Policy and Implementation Framework. Botswana: MFDP.
Mohammed, I.A. and Alshaoush, O.S. (2018). Critical success factors for the public-private partnership in electric infrastructure projects in Hadhramout-Yemen. International Journal of Civil Engineering and Technology, 9(9): 1971–1984.
Ngoma, S., Mundia, M. and Kaliba, C. (2014). Benefits, constraints and risks in infrastructure development via public-private partnerships in Zambia. Journal of Construction in Developing Countries, 19(1): 15–33.
Ngullie, N., Maturi, K.C., Kalamdhad, A.S. and Laishram, B. (2021). Critical success factors for PPP MSW projects: Perception of different stakeholder groups in India. Environmental Challenges, 5: 1–10. https://doi.org/10.1016/j.envc.2021.100379
Nguyen, P.T., Likhitruangsilp, V. and Onishi, M. (2020), Success factors for public-private partnership infrastructure projects in Vietnam. International Journal on Advanced Science, Engineering and Information Technology, 10(2): 858–865. https://doi.org/10.18517/ijaseit.10.2.5839
. (2018). Prioritising factors affecting traffic volume of public-private partnership infrastructure projects. International Journal Engineering Technology, 7(4): 2988–2991.
Nulty, D.D. (2008). The adequacy of response rates to online and paper surveys: What can be done? Assessment and Evaluation in Higher Education, 33(3): 301–314. https://doi.org/10.1080/02602930701293231
Nunnally, J. (1978). Psychometric Theory. 2nd Ed. New York: McGraw-Hill.
Okoro, C.S. (2019). Delivering sustainable transportation infrastructure: critical role of a comprehensive feasibility study. PhD diss. University of Johannesburg.
Okoro, C.S., Muleya, F. and Musonda, I. (2022). Assessing the role of planning and considerations in the sustainability of BRT-PPP projects: A South African case. Journal of Construction in Developing Countries, 27(2): 205–234. https://doi.org/10.21315/jcdc-04-21-0064
Okoro, C.S., Musonda, I. and Agumba, J. (2018). Critical planning considerations for PPP road project sustainability: A case study approach. Paper presented at the Development and Investment in Infrastructure Conference. Livingstone, Zambia, 11–13 July.
. (2017). Feasibility study considerations for transport infrastructure performance: A desk study. Paper presented at the Ninth International Conference on Construction in the 21st Century (CITC-9). Dubai, 5–7 March.
Onishi, H. (2014). Transport in Africa: The African Development Bank’s Intervention and Results for the Last Decade; Summary Evaluation Report. Abidjan, Ivory Coast: African Development Bank Group.
Opoku, A., Ahmed, V. and Akotia, J. (2016). Choosing an appropriate research methodology and method. In V. Ahmed, A. Opuku and Z. Aziz (eds.), Research Methodology in the Built Environment: A Selection of Case Studies. London: Routledge. https://doi.org/10.4324/9781315725529
Oraegbune, O.M. and Ugwu, O.O. (2020). Delivering sustainable transport infrastructure projects (railway) in Nigeria: Frameworks, indicators, method and tools. Nigerian Journal of Technology, 39(3): 665–679. https://doi.org/10.4314/njt.v39i3.4
Osei-Kyei, R. and Chan, A.P.C. (2019). Model for predicting the success of public-private partnership infrastructure projects in developing countries: A case of Ghana. Architectural Engineering and Design Management, 15(3): 213–232. https://doi.org/10.1080/17452007.2018.1545632
. (2017). Implementation constraints in public-private partnership: Empirical comparison between developing and developed economies/countries. Journal of Facilities Management, 15(1): 90–106. https://doi.org/10.1108/JFM-07-2016-0032
. (2015). Review of studies on the critical success factors for public–private partnership (PPP) projects from 1990 to 2013. International Journal Project Management, 33(6): 1335–1346. https://doi.org/10.1016/j.ijproman.2015.02.008
Othman, S.M.E., Steen, M. and Fleet, J.A. (2020). A sequential explanatory mixed methods study design: An example of how to integrate data in a midwifery research project. Journal of Nursing Education and Practice, 11(2): 1–16. https://doi.org/10.5430/jnep.v11n2p75
Owolabi, H.A., Oyedele, L.O., Alaka, H.A., Ajayi, S.O., Akinade, O.O. and Bilal, M. (2020). Critical success factors for ensuring bankable completion risk in PFI/ PPP megaprojects. Journal of Management in Engineering, 36(1): 1–16. https://doi.org/10.1061/(ASCE)ME.1943-5479.0000717
Pârvu, D. and Voicu-Olteanu, C. (2009). Advantages and limitations of the public private partnerships and the possibility of using them in Romania. Transylvanian Review of Administrative Sciences, 5(27): 189–198.
Pieroni, M.P.P., McAloone, T.C. and Pigosso, D.C.A. (2019). Business model innovation for circular economy and sustainability: A review of approaches. Journal of Cleaner Production, 215: 198–216. https://doi.org/10.1016/j.jclepro.2019.01.036
Popoola, A., Akogun, O., Magidimisha-Chipungu, H. and Chipungu, L. (2022). Transport poverty: A comparative study between South Africa and Nigeria. The Open Transportation Journal, 16: 1–10 https://doi.org/10.2174/18744478-v16-e2207200
Prabhudesai, V. and Sarode, N.G. (2018). Critical success factors of public-private partnership for road sector development in India: A private sector perspective. IUP Journal of Business Strategy, 15(4): 45–56.
Rowley, J. (2014). Designing and using research questionnaires. Management Research Review, 37(3): 308–330. https://doi.org/10.1108/MRR-02-2013-0027
Sanni, A.O. (2016). Factors determining the success of public private partnership projects in Nigeria. Construction Economics and Building, 16(2): 42–55. https://doi.org/10.5130/AJCEB.v16i2.4828
Santos, J.L.G.D., Erdmann, A.L., Meirelles, B.H.S., Lanzoni, G.M.D.M., Cunha, V.P.D. and Ross, R. (2017). Integrating quantitative and qualitative data in mixed methods research. Texto Contexto Enferm, 26(3): 1–9. http://dx.doi. org/10.1590/0104-07072017001590016
Santos, R.D.O., Gorgulho, B.M., Castro, M.A.D., Fisberg, R.M., Marchioni, D.M. and Baltar, V.T. (2019). Principal component analysis and factor analysis: Differences and similarities in nutritional epidemiology application. Revista Brasileira de Epidemiologia, 22: 1–14. https://doi.org/10.1590/1980-549720190041
Schryen, G., Wagner, G. and Benlian, A. (2015). Theory of knowledge for literature reviews: An epistemological model, taxonomy and empirical analysis of IS literature, In Proceedings of the Thirty Sixth International Conference on Information Systems, ICIS 2015. Fort Worth: Association for Information Systems, 1–22.
Sebitlo, O. K., Mbara, T. and Luke, R. (2022). The state of South Africa’s public-private partnership practices in transport projects: Problems and potential. Journal of Transport and Supply Chain Management, 16: a733. https://doi.org/10.4102/jtscm.v16i0.733
Seeletse, S.M. (2016). Performance of South African private-public partnerships. Problems and Perspectives in Management, 14(2): 19–26. https://doi.org/10.21511/ppm.14(2).2016.02
Simon, L., Jefferies, M., Davis, P. and Newaz, M.T. (2020). Developing a theoretical success factors framework for the tendering phase of social infrastructure PPPs. International Journal of Construction Management, 20(6): 613–627. https://doi.org/10.1080/15623599.2020.1720343
Skorobogatova, O. and Kuzmina-Merlino, I. (2017). Transport infrastructure development performance. Procedia Engineering, 178: 319–329. https://doi.org/10.1016/j.proeng.2017.01.056
South, A.J., Levitt, R.E., Dewulf, G.P.M.R. (2015). Dynamic stakeholder networks and the governance of PPPs: Advances in public-private partnerships. Paper presented at the 2nd International Conference on Public-Private Partnerships. Texas, USA, 26–29 May.
Tarraco, R.J. (2005). Writing integrative literature reviews: Guidelines and examples, Human Resource Development Review, 4(3): 356–367. https://doi.org/10.1177/1534484305278283
United Nations (2022). African report of the secretary general implementation of the Vienna programme of action for landlocked developing countries for the decade 2014–2024. Available at: https://www.un.org/ohrlls/sites/www.un.org.ohrlls/files/eca-2022.pdf [Accessed 24 February 2023].
. (2020). Financing for sustainable development report 2020. Report of the inter-agency task force on financing for development. Available at: https://financing.desa.un.org/sites/default/files/2022-02/FSDR_2020_0.pdf [Accessed 24 February 2023].
Voordijk, H. (2012). Contemporary issues in construction in developing countries. Construction Management and Economics, 30(4): 331–333. https://doi.org/10.1080/01446193.2012.665171
Voordijk, J.T., Liyanage, C. and Temeljotov-Salaj, A. (2016). Critical success factors in different stages of delivery in PPP transport infrastructure projects. In A. Roumboutsos (ed.), Public Private Partnerships in Transport: Trends and Theory. London: Routledge, 201–217.
Wang, N., Ma, M. and Liu, Y. (2020). The whole lifecycle management efficiency of the public sector in PPP infrastructure projects. Sustainability, 12(7): 1–17. https://doi.org/10.3390/su12073049
Wang, Y. (2015). Evolution of public-private partnership models in American toll road development: Learning based on public institutions’ risk management. International Journal of Project Management, 33(3): 684–696. https://doi.org/10.1016/j.ijproman.2014.10.006
Watkins, M.W. (2018). Exploratory factor analysis: A guide to best practice. Journal of Black Psychology, 44(3): 219–246. https://doi.org/10.1177/0095798418771807
Wibowo, A. and Alfen, H.W. (2015). Government-led critical success factors in PPP infrastructure development. Built Environment Project and Asset Management, 5(1): 121–134. https://doi.org/10.1108/BEPAM-03-2014-0016
World Economic Forum (WEF). (2021). Introduction: The Operations and Maintenance (OandM) Imperative: The Global Infrastructure Gap. Cologny, Switzerland: WEF.
Yang, X., Niu, F. and Sun, D. (2020). Evaluation of urban spatial equality based on accessibility to economic activities: Beijing as a case study. Complexity, 2020: 1–12. https://doi.org/10.1155/2020/4560146
Yuan, J., Li, W., Guo, J., Zhao, X. and Skibniewski, M.J. (2018). Social risk factors of transportation PPP projects in China: A sustainable development perspective. International Journal of Environmental Research and Public Health, 15(7): 1–25. https://doi.org/10.3390/ijerph15071323
Zhang, X. and Chen, S. (2013). A systematic framework for infrastructure development through public private partnerships. IATSS Research, 36(2): 88–97. https://doi.org/10.1016/j.iatssr.2012.11.001