Table 1. Article selection process,... | Emerald Publishing

Table 1.

Article selection process, inclusion and exclusion criteria

S/N	Sample selectionª	Description
1	Research aim	a. Literature on barriers to GPP performance evaluation for public sector institutions
2	Databases	Scopus Web of Science (WoS) Science Direct (SD) Google Scholar (GS)
3	Search fields	Title, abstract and keywords
4	Date of database search	Up to 24 April 2025
5	Keywords	Scopus and WoS – [TITLE-ABS-KEY (green OR environment* OR sustainab* OR eco AND public OR state OR government* AND procurement* OR purchas) AND TITLE-ABS-KEY (barrier OR challenge) AND TITLE-ABS-KEY (performanc) AND TITLE-ABS-KEY (evaluation OR assessment OR measurement OR audit OR implementation OR monitoring OR appraisal)] AND [LIMIT-TO (LANGUAGE , “English”)]
		Google Scholar and Science Direct - “barriers to green public procurement performance evaluation”, limited to English
		Justification for different search strings – Google Scholar and Science Direct do not accommodate Boolean operators, which made it necessary to introduce a different search string
6	Inclusion criteria	Topic: barriers to green public performance evaluation. green public procurement evaluation, green government procurement performance monitoring, green supply chain, purchasing, supplier evaluation, tender evaluation and supplier performance, performance evaluation, GPP implementation, GPP practice, were all includedJustification for inclusion – green public procurement is part of a green supply chain, and suppliers and tenders all fall within the procurement process. The barriers were extended to other areas of GPP such as implementation, practice, monitoring and so on b. Language – EnglishJustification for English – the first language of all authors to avoid misinterpretation and the dominant language for procurement and supply chain c. Document type – No limitation on the type of document.Justification – peer-reviewed papers are high quality. Grey literature helps reduce publication bias, improve comprehensiveness and a balanced perspective of the review d. Articles that mention performance or evaluation as a barrier to GPP or its related concepts, e.g. sustainable public procurement, tendering, supplier selection, green supply chain, etc.
7	Exclusion	Topic: articles that did not address barriers to GPP performance evaluation assessment or measurement Documents – barriers that were not related to public sector procurement

S/N	Sample selectionª	Description
1	Research aim	a. Literature on barriers to GPP performance evaluation for public sector institutions
2	Databases	Scopus Web of Science (WoS) Science Direct (SD) Google Scholar (GS)
3	Search fields	Title, abstract and keywords
4	Date of database search	Up to 24 April 2025
5	Keywords	Scopus and WoS – [TITLE-ABS-KEY (green OR environment* OR sustainab* OR eco AND public OR state OR government* AND procurement* OR purchas) AND TITLE-ABS-KEY (barrier OR challenge) AND TITLE-ABS-KEY (performanc) AND TITLE-ABS-KEY (evaluation OR assessment OR measurement OR audit OR implementation OR monitoring OR appraisal)] AND [LIMIT-TO (LANGUAGE , “English”)]
		Google Scholar and Science Direct - “barriers to green public procurement performance evaluation”, limited to English
		Justification for different search strings – Google Scholar and Science Direct do not accommodate Boolean operators, which made it necessary to introduce a different search string
6	Inclusion criteria	Topic: barriers to green public performance evaluation. green public procurement evaluation, green government procurement performance monitoring, green supply chain, purchasing, supplier evaluation, tender evaluation and supplier performance, performance evaluation, GPP implementation, GPP practice, were all includedJustification for inclusion – green public procurement is part of a green supply chain, and suppliers and tenders all fall within the procurement process. The barriers were extended to other areas of GPP such as implementation, practice, monitoring and so on b. Language – EnglishJustification for English – the first language of all authors to avoid misinterpretation and the dominant language for procurement and supply chain c. Document type – No limitation on the type of document.Justification – peer-reviewed papers are high quality. Grey literature helps reduce publication bias, improve comprehensiveness and a balanced perspective of the review d. Articles that mention performance or evaluation as a barrier to GPP or its related concepts, e.g. sustainable public procurement, tendering, supplier selection, green supply chain, etc.
7	Exclusion	Topic: articles that did not address barriers to GPP performance evaluation assessment or measurement Documents – barriers that were not related to public sector procurement

Source(s): Authors’ own work (2024)