Figure 5.
The hierarchical map organises barriers to Green Public Procurement, G P P, performance evaluation into two groups labelled Critical Barriers and Non Critical Barriers. The central node is Barriers to Green Public Procurement, G P P, Performance Evaluation. One branch leads to Critical Barriers and lists Knowledge barriers with 28 papers, Awareness barriers with 25 papers, Budget constraints with 23 papers, Resistance to change with 20 papers, Regulatory barriers with 20 papers, Prioritise social development and cost with 19 papers, Commitment and collaboration among stakeholders with 18 papers, Lack of management support and motivation with 17 papers, Government support and incentives with 17 papers, Inappropriate internal structures and culture with 16 papers, Unavailability of green products with 16 papers, Inadequate education and training with 15 papers, Lack of G P P skills and expertise with 15 papers, Lack of methods and tools for evaluation with 15 papers, Lack of unified or realistic policies with 13 papers, Green perception with 12 papers, Guideline issues with 12 papers, Lack of procurement systems with 10 papers, and Lack of resources with 10 papers. Another branch leads to Non Critical Barriers and lists Readiness and demand for green products with 10 papers, Lack of monitoring and evaluation with 9 papers, Lack of communication with 8 papers, Lack of standards and practices for G P P with 8 papers, Inadequate procedure for procurement with 6 papers, Ambiguous criteria with 6 papers, Enforcement and compliance with 6 papers, Relationship among stakeholders with 6 papers, Poor record keeping with 4 papers, Inadequate specification issues with 4 papers, Innovation and technology with 4 papers, Corruption with 3 papers, Lack of industry support and inadequate supplier capacity with 3 papers, and Ethical concerns with 1 paper.Critical and non-critical barriers to GPP performance evaluation