Procedures for Awarding Work Contracts in Europe

: Choosing a contractor with the best competencies is particularly important, especially in construction contracts. Using data available on the opentender.eu platform, information for 2022 was compiled regarding the size of the public procurement market and the procedures used in public procurement for construction works in European countries. The most common procedure used under the European Union Directive for awarding work contracts, in most countries, is the open procedure. The largest share of this procedure, amounting to over 95% of all proceedings, is in the countries Croatia, Cyprus, Greece, Latvia, and Poland. On the other hand, there are countries where the procedures proposed in the Directive are used to a small extent. In order to distinguish groups of European Union countries characterized by a similar structure of public procurement for work, the joining (tree-clustering) algorithm was used. This will provide insights into the strategies of countries in this area. Knowledge of the advantages and disadvantages of the various procedures may improve the public procurement system.


Introduction
The legal basis for the selection of public procurement procedures in the countries of the European Union is Directive 2014/24/EU of 26 February 2014 on public procurement.According to European Union (EU) regulations, a public owner can use one of several procedures.Various procedures have different options for assessing the contractor and evaluating the tender, and each has both advantages and disadvantages.Knowing them allows one to choose the most effective procedure, tailored to the conditions of a given order.An inadequate procurement system can result in poor-quality buildings delivered late, at overestimated costs, and by an antagonistic executive team [1,2].At the same time, research shows that construction practitioners have increasingly become aware of various procurement options [3] and understand that each procurement route contributes to project success to diverse degrees [1,4].
EU countries, in terms of contracts below certain values, may shape their own solutions regarding the structure of their procurement procedures.Data from 2022 on the use of public procurement procedures in individual EU countries were analyzed.Using the cluster method, EU countries were grouped depending on the use of public procurement procedures for construction works.This will provide insight into the strategies of countries in this area.Procurement systems in EU countries are constantly improving, and knowledge of the advantages and disadvantages of the various procedures may improve the public procurement system.

Literature Review
The choice of an appropriate procurement procedure is the first step toward construction project success [5].Many authors have devoted their research to the selection of the most appropriate procurement method [6][7][8].To build procurement system selection models, authors have used various methods and mathematical tools, such as the Delphi method [9]; fuzzy logic [10]; and the analytical hierarchy process [11].
Even though all public procurement systems are guided by similar principles, such as non-discrimination, equal treatment, transparency, and proportionality, there are procedural differences between countries.Fuentes-Bargues et al. [12] discuss environmental criteria in Spanish procurement procedures.Jimoh et al. [13] describe public procurement work selection criteria in Nigeria.Rahmani et al. [14] present an overview of construction procurement methods in Australia.Smith et al. [15] analyze the procurement of construction facilities in China.Rajeh [16] conducted research aimed at managing the time spent on procurement activities.According to a study in New Zealand, every day, project managers spend about 50% of their time on procurement systems.The objective of another paper [17] was to examine strategies in construction contract arrangements and procurement practices applied to the US construction industry.
Many works are devoted to procurement selection criteria.The aim of one paper [3] was to establish the fuzzy membership function of procurement selection criteria through an empirical study conducted in Australia.This topic is also discussed in [1,18].Construction procurement procedures require careful risk management [4,[19][20][21].Based on contract data available from the U.S. federal government, for fiscal years 2015 to 2018, Atkinson [22] tries to decide what federal procurement data say about the nature of full and open competition in practice.The advantages and disadvantages of individual public procurement procedures (open, restricted, negotiated, etc.), as well as the possibilities of improving their effectiveness, are discussed, for example, in [23][24][25][26].
The goal of the study by [27] was to identify, assess, and rank the most relevant aspects in tender appraisal, taking into account their interconnection.One paper [25] is a piece of applied research presenting the development of a new, cost-effective procurement strategy for public works geared at the EU's legal framework.The study by Jelodar [28] proposes a framework of actions and seven strategies that can facilitate attributes associated with relationship quality evaluation in a construction project's procurement practices.
Public procurement is increasingly seen as an important potential instrument of innovation policy [29,30].Choosing a given procurement method results in certain differences in the criteria and rules for selecting a contractor and a tender.These issues are discussed, for example, in [31,32].Chong and Preece [33] showed that the characteristics of organizational principles are complementary to procurement systems.A mechanism for assessing the key areas of compatibility was developed using the McKinsey 7 S model.On the other hand, Eriksson and Westerberg [34] claim that cooperative procurement procedures have a positive influence on project performance.
The most important procurement topics addressed by the researchers are summarized in Table 1.

Legal Basis for Awarding Work Contracts in Europe
According to Directive 2014/24/EU of the European Parliament, when awarding public contracts above a certain value (called a threshold), provisions should have national coordination.Nowadays, for public works contracts, the threshold is EUR 5,382,000.
Contract award methods vary somewhat from one procedure to another.In general, the two basic stages are the selection of contractors (based on legibility, exclusion criteria, and contractor selection criteria) and the selection of a tender (based on the award criteria).It should be noted here that the Directive distinguishes clearly between selection criteria and award criteria.This is schematically illustrated in Figure 1.

Legal Basis for Awarding Work Contracts in Europe
According to Directive 2014/24/EU of the European Parliament, when awarding public contracts above a certain value (called a threshold), provisions should have national coordination.Nowadays, for public works contracts, the threshold is EUR 5,382,000.
Contract award methods vary somewhat from one procedure to another.In general, the two basic stages are the selection of contractors (based on legibility, exclusion criteria, and contractor selection criteria) and the selection of a tender (based on the award criteria).It should be noted here that the Directive distinguishes clearly between selection criteria and award criteria.This is schematically illustrated in Figure 1.The criteria in step 1 of the selection procedure constitute the basis for excluding a contractor from the procurement procedure.Here, the Directive lists both criteria that are obligatory for the contracting authority (for instance, participation in a criminal organization or corruption) and optional ones (for example, when the contractor is bankrupt).Contractor selection criteria may relate to (a) the suitability of pursuing the professional activity; (b) economic and financial standing; and (c) technical and professional ability.All requirements shall be related and proportionate to the subject matter of the contract.
Contract award criteria should allow for the selection of the most economically advantageous tender.The most economically advantageous tender should be identified on the basis of the price or cost, using a cost-effectiveness approach, such as life-cycle costing.Other criteria may concern, in accordance with the Directive, such aspects as the following: (a) Quality, including aesthetic and functional characteristics, accessibility, environmental, and innovative characteristics; (b) The experience and qualifications of staff assigned to perform the contract; (c) Technical assistance and after-sales services.
The contracting authority should also determine the weights of the tender award criteria.

Procurement Procedures
According to the EU Directive, the public owner can use one of the following procedures: an open procedure, a restricted procedure, a negotiated procedure with prior calls for competition, a competitive dialog, or an innovation partnership.In the following section, procedural flowcharts are presented, highlighting the steps in the selection of contractors and tender evaluation.The criteria in step 1 of the selection procedure constitute the basis for excluding a contractor from the procurement procedure.Here, the Directive lists both criteria that are obligatory for the contracting authority (for instance, participation in a criminal organization or corruption) and optional ones (for example, when the contractor is bankrupt).Contractor selection criteria may relate to (a) the suitability of pursuing the professional activity; (b) economic and financial standing; and (c) technical and professional ability.All requirements shall be related and proportionate to the subject matter of the contract.
Contract award criteria should allow for the selection of the most economically advantageous tender.The most economically advantageous tender should be identified on the basis of the price or cost, using a cost-effectiveness approach, such as life-cycle costing.Other criteria may concern, in accordance with the Directive, such aspects as the following: (a) Quality, including aesthetic and functional characteristics, accessibility, environmental, and innovative characteristics; (b) The experience and qualifications of staff assigned to perform the contract; (c) Technical assistance and after-sales services.
The contracting authority should also determine the weights of the tender award criteria.

Procurement Procedures
According to the EU Directive, the public owner can use one of the following procedures: an open procedure, a restricted procedure, a negotiated procedure with prior calls for competition, a competitive dialog, or an innovation partnership.In the following section, procedural flowcharts are presented, highlighting the steps in the selection of contractors and tender evaluation.

Open Procedure
In open procedures, any interested contractor can submit a tender in response to a call for competition.An open procedure is a "one step" procedure-the selection of contractors and tender evaluation are in one step.Contractors submit both qualification (selection) information and tender at the same time.The public owner can assess the competence of contractors but only in a "zero-one" way, that is, to check whether the contractor meets the basic, specified requirements.There is no stage of pre-selection of contractors, which does not allow for a thorough understanding of the contractors' qualifications.The tender is selected only on the basis of criteria relating to the bid.These criteria cannot relate to the competence of the contractors.The evaluation stages in the open procedure are shown in Figure 2.
In open procedures, any interested contractor can submit a tender in response to a call for competition.An open procedure is a "one step" procedure-the selection of contractors and tender evaluation are in one step.Contractors submit both qualification (selection) information and tender at the same time.The public owner can assess the competence of contractors but only in a "zero-one" way, that is, to check whether the contractor meets the basic, specified requirements.There is no stage of pre-selection of contractors, which does not allow for a thorough understanding of the contractors' qualifications.The tender is selected only on the basis of criteria relating to the bid.These criteria cannot relate to the competence of the contractors.The evaluation stages in the open procedure are shown in Figure 2.

Restricted Procedure
In restricted procedures, any contractor can submit a request to participate in a response to a call for competition.In a request to participate, the contractor provides the information for qualitative selection.Only contractors invited by the public owner can submit a tender.A restricted procedure is a "two-step" procedure.The contractor selection is clearly separate from the evaluation of the tender.The contracting authority has the opportunity to carefully assess the competence of contractors (pre-qualification) and limit their number to only the best (most qualified) ones.This means that not all of the contractors that qualify have to be invited to tender.No negotiations are permitted with contractors.The evaluation stages in the restricted procedure are shown in Figure 3.

Restricted Procedure
In restricted procedures, any contractor can submit a request to participate in a response to a call for competition.In a request to participate, the contractor provides the information for qualitative selection.Only contractors invited by the public owner can submit a tender.A restricted procedure is a "two-step" procedure.The contractor selection is clearly separate from the evaluation of the tender.The contracting authority has the opportunity to carefully assess the competence of contractors (pre-qualification) and limit their number to only the best (most qualified) ones.This means that not all of the contractors that qualify have to be invited to tender.No negotiations are permitted with contractors.The evaluation stages in the restricted procedure are shown in Figure 3.
In open procedures, any interested contractor can submit a tender in response to a call for competition.An open procedure is a "one step" procedure-the selection of contractors and tender evaluation are in one step.Contractors submit both qualification (selection) information and tender at the same time.The public owner can assess the competence of contractors but only in a "zero-one" way, that is, to check whether the contractor meets the basic, specified requirements.There is no stage of pre-selection of contractors, which does not allow for a thorough understanding of the contractors' qualifications.The tender is selected only on the basis of criteria relating to the bid.These criteria cannot relate to the competence of the contractors.The evaluation stages in the open procedure are shown in Figure 2.

Restricted Procedure
In restricted procedures, any contractor can submit a request to participate in a response to a call for competition.In a request to participate, the contractor provides the information for qualitative selection.Only contractors invited by the public owner can submit a tender.A restricted procedure is a "two-step" procedure.The contractor selection is clearly separate from the evaluation of the tender.The contracting authority has the opportunity to carefully assess the competence of contractors (pre-qualification) and limit their number to only the best (most qualified) ones.This means that not all of the contractors that qualify have to be invited to tender.No negotiations are permitted with contractors.The evaluation stages in the restricted procedure are shown in Figure 3.

Negotiated Procedure with Prior Call for Competition
In negotiated procedures with a prior call for competition, any contractor can submit a request to participate.Only contractors invited by the public owner can participate in the negotiations.This case of the negotiated procedure is, therefore, a "two-step" procedure, with the possibility of both limiting the number of contractors and negotiating with them.The evaluation stages in the procedure are shown in Figure 4.

Negotiated Procedure with Prior Call for Competition
In negotiated procedures with a prior call for competition, any contractor can submit a request to participate.Only contractors invited by the public owner can participate in the negotiations.This case of the negotiated procedure is, therefore, a "two-step" procedure, with the possibility of both limiting the number of contractors and negotiating with them.The evaluation stages in the procedure are shown in Figure 4.

Competitive Dialog
Competitive dialogs refer to a "two-step" procedure similar to negotiated procedures with a prior call for competition.The difference is that, during the competitive dialog phase, all aspects of the project can be discussed by the contractors and the owner.When the public owner receives a proposal that meets his/her requirements, he/she can close the competitive dialog and invite tenders.Tenders can only be evaluated on the basis of the best price-quality ratio.Stages in the competitive dialog procedure are shown in Figure 5.

Innovation Partnership and the Negotiated Procedure without a Prior Call for Competition
In innovation partnerships, in the procurement documents, the public owner can identify the need for innovative work that cannot be bought on the existing market.The

Competitive Dialog
Competitive dialogs refer to a "two-step" procedure similar to negotiated procedures with a prior call for competition.The difference is that, during the competitive dialog phase, all aspects of the project can be discussed by the contractors and the owner.When the public owner receives a proposal that meets his/her requirements, he/she can close the competitive dialog and invite tenders.Tenders can only be evaluated on the basis of the best price-quality ratio.Stages in the competitive dialog procedure are shown in Figure 5.

Negotiated Procedure with Prior Call for Competition
In negotiated procedures with a prior call for competition, any contractor can submit a request to participate.Only contractors invited by the public owner can participate in the negotiations.This case of the negotiated procedure is, therefore, a "two-step" procedure, with the possibility of both limiting the number of contractors and negotiating with them.The evaluation stages in the procedure are shown in Figure 4.

Competitive Dialog
Competitive dialogs refer to a "two-step" procedure similar to negotiated procedures with a prior call for competition.The difference is that, during the competitive dialog phase, all aspects of the project can be discussed by the contractors and the owner.When the public owner receives a proposal that meets his/her requirements, he/she can close the competitive dialog and invite tenders.Tenders can only be evaluated on the basis of the best price-quality ratio.Stages in the competitive dialog procedure are shown in Figure 5.

Innovation Partnership and the Negotiated Procedure without a Prior Call for Competition
In innovation partnerships, in the procurement documents, the public owner can identify the need for innovative work that cannot be bought on the existing market.The

Innovation Partnership and the Negotiated Procedure without a Prior Call for Competition
In innovation partnerships, in the procurement documents, the public owner can identify the need for innovative work that cannot be bought on the existing market.The difference between this procedure and the negotiated procedure with a prior call for competition is the abandonment of a public announcement of the procedure and the limitation of contractors only to those invited by the public owner.
Stages in negotiated procedure without a prior call for competition are shown in Figure 6.
difference between this procedure and the negotiated procedure with a prior call for competition is the abandonment of a public announcement of the procedure and the limitation of contractors only to those invited by the public owner.
Stages in negotiated procedure without a prior call for competition are shown in Figure 6.

Application of Public Procurement Procedures for Construction Works in EU Countries
Using data available on the opentender.euplatform, information for 2022 has been compiled regarding the size of the public procurement market and the procedures used in public procurement for construction work in EU countries.The results are summarized in Table 2.

Application of Public Procurement Procedures for Construction Works in EU Countries
Using data available on the opentender.euplatform, information for 2022 has been compiled regarding the size of the public procurement market and the procedures used in public procurement for construction work in EU countries.The results are summarized in Table 2.  (1) Open procedure; (2) restricted procedure; (3) negotiated procedures with a prior call for competition; (4) competitive dialog; (5) negotiated procedure without a prior call for competition.
Column 3 of Table 2 provides the value of public procurement in millions of Euros, and column 4 shows the number of these contracts.Columns 5 to 10 contain the percentage share of orders carried out under a given procedure in terms of the total number of orders in a given country.Table 3 presents basic statistical data on construction contracts in EU countries in 2022.The presented data (Tables 2 and 3) show that the total value of construction contracts in 27 EU countries in 2022 amounted to almost EUR 40 million, and over 103,000 proceedings were conducted.In terms of the number of proceedings, Spain is the record holder, with over 26,000 proceedings carried out, with a relatively low value (EUR 7900 million).For comparison, in Germany, where the value of proceedings was the highest (EUR 8300 million), there were approximately half as many proceedings as in Spain.One of the main reasons may be the specificity of the procedures used in Spain, namely, a small share of open tendering, while a significant number of procedures were conducted in the approaching bidder (12,640) or mini-tender (1964) modes, which are usually related to low-value orders.
The most common procedure used under the Directive for awarding work contracts in most EU countries is the open procedure.On the other hand, there are countries where the procedures proposed in the Directive are used to a small extent, and other solutions are often used.In Romania, 99% of the procedures used are different from those listed in the Directive.
The use of individual procedures in countries such as Denmark, Ireland, and the Netherlands is interesting and slightly different.The use of open tendering is quite low here, but procedures outside the Directive are not used either.However, the share of restricted or negotiated procedures provided by the Directive is significant.
By far the most used procedures are open and restricted.Figure 7 shows the percentage share of these procedures in individual EU countries.participation in public procurement.The largest share of this procedure, amounting to over 95% of all proceedings, is in the countries Croatia, Cyprus, Greece, Latvia, and Poland.

Cluster Analysis
In order to distinguish groups of EU countries characterized by a similar structure of public procurement for work, a joining (tree-clustering) algorithm method was used.The goal of the joining algorithm is to join together objects into successively larger clusters, The most common procedure used under the Directive for awarding work contracts in most EU countries is the open procedure.This is a procedure that does not allow for the pre-selection of contractors or a thorough evaluation of their competence.However, this is the most competitive procedure, providing potentially the widest access to participation in public procurement.The largest share of this procedure, amounting to over 95% of all proceedings, is in the countries Croatia, Cyprus, Greece, Latvia, and Poland.

Cluster Analysis
In order to distinguish groups of EU countries characterized by a similar structure of public procurement for work, a joining (tree-clustering) algorithm method was used.The goal of the joining algorithm is to join together objects into successively larger clusters, using some measure of similarity or distance.Ward's method and the Euclidean distance measure were used for the analyses.
Ward's method uses an analysis of variance approach to evaluate the distances between clusters.This method attempts to minimize the Sum of Squares (SS) of any two (hypothetical) clusters that can be formed at each step.All calculations were performed in the Statistica program.The obtained results are presented in Figure 8 and Table 4.

Cluster Analysis
In order to distinguish groups of EU countries characterized by a similar structure of public procurement for work, a joining (tree-clustering) algorithm method was used.The goal of the joining algorithm is to join together objects into successively larger clusters, using some measure of similarity or distance.Ward's method and the Euclidean distance measure were used for the analyses.
Ward's method uses an analysis of variance approach to evaluate the distances between clusters.This method attempts to minimize the Sum of Squares (SS) of any two (hypothetical) clusters that can be formed at each step.All calculations were performed in the Statistica program.The obtained results are presented in Figure 8 and Table 4.It can be noticed that the division into clusters (Tables 4 and 5) is similar here, especially when it comes to k-means Cluster 3, which corresponds to Cluster 4 in Ward's method, and k-means Cluster 2, which corresponds to Cluster 1 in Ward's method.Differences occur mainly in relation to Germany, which, in the k-means method, is included in one cluster with Austria, Estonia, and Slovenia, but in Ward's method, is in one cluster with Czech Republic, France, Hungary, Romania, Slovakia, and Spain.

Discussion
The most common procedure used under the Directive for awarding work contracts in most EU countries is the open procedure.Croatia, Cyprus, Greece, Italy, Latvia, Lithuania, Luxemburg, Poland, and Sweden in Cluster 1 (Ward's method) and Cluster 2 (k-means method) are characterized by a high share of open procedures (on average, 94.33% of the number of procedures).It should be noted that these are the most numerous clusters in the analyses.
The open procedure is available to all interested contractors.This increases competition, and there is no favoritism toward any of the contractors.On the other hand, with a high level of interest and a significant number of contractors, this method can be a waste of contractors' resources, as many of them will prepare bids that have no chance.In addition, knowing that their chances of winning the contract are slim, contractors may not analyze the contract in detail to determine the minimum price but instead quote a price that will bring them a profit if they win the contract.If the public owner chooses the lowest bid, he risks the contractor not being able to complete the project in a satisfactory manner.
There are countries where the procedures proposed in the Directive are used to a small extent, and other solutions are often used.This is particularly evident in countries belonging to Cluster 3 (Ward's method) and Cluster 4 (k-means method).In Romania, 99% of the procedures used are different from those listed in the Directive, constituting the outright award procedure.This procedure is also used quite often in France.In Slovakia and the Czech Republic, the approaching bidder procedure is largely used.It should be noted that this type of procedure should be used mainly in "urgent" or "extremely urgent" procurements.This requires significantly shorter advertisement and decision periods and simpler technical and administrative procedures.However, any form of competition restriction increases the risk of corruption; hence, it should only be used under very specific circumstances or in a limited timeframe.The advantage of negotiation is the opportunity to establish technical details and to accurately assess the competence and reliability of the contractor.A direct award also allows the owner to work with a contractor who is already known and with a good reputation.
The use of procedures other than those listed in the Directive may also be a barrier for contractors from other countries.An example is the already-discussed Spain, where the participation of foreign companies in public procurement is very low.The main reason is that foreign companies do not know about tender announcements.Generally, they are published by local and regional public entities.Public bodies very often provide only basic information without any guidance directed to foreign companies.Foreign companies are not confident in the Spanish public procurement system.According to [35], in Spain and France, the number of public construction contracts awarded to foreign companies is less than half a percent.Similar relationships are found in the other countries of the discussed clusters [36].
The use of individual procedures in countries belonging to Cluster 4 (Ward's method) and Cluster 3 (k-means method), Belgium, Bulgaria, Denmark, Finland, Ireland, and the Netherlands, is interesting and slightly different.The use of open tendering is quite low here, but procedures outside the Directive are not used either.However, the share of restricted or negotiated procedures provided by the Directive is significant.This results in easier access to public procurement in the country for foreign companies.According to a previously mentioned report [35], in Finland, around 15 percent of public construction contracts are awarded to foreign companies.The situation is similar in other countries belonging to Cluster 4 (Ward's method) and Cluster 3 (k-means method).
EU countries recognize the problem and are making changes accordingly.In the previously mentioned Romania, for example, the year 2022 was a record year in terms of introducing changes to the public procurement law.

Conclusions
Choosing a contractor with the best competencies for a given contract is particularly important, especially in construction contracts.The use of tendering procedures prevents bias in bid evaluations and allows for healthy competition between contractors.It also allows clients to select the contractor most suitable for a given contract.
The EU public procurement Directive specifies the rules for both the selection of contractors and the evaluation of tenders.Various public procurement procedures are also proposed here.In each of them, the process of evaluating the contractor and the offer is slightly different.Moreover, in contracts below certain values, EU countries may shape their own solutions regarding the course of the procedure.This paper characterizes the procedures provided by the Directive, paying attention mainly to the stages and methods of assessing contractors and tenders.
Then, based on the data available on the opentender.euplatform, data for 2022 regarding public procurement for construction works in individual EU countries were presented.This allowed us to better determine the differences in the use of individual procedures that occur in individual countries.Cluster analysis allowed for the designation of homogeneous groups of EU countries with similar policies and characteristics in the field of public procurement.
The most numerous clusters in the analysis show countries in which the share of open procedures is very high.On the other hand, in the cluster that includes Romania, Slovakia, and Spain, the procedures proposed in the Directive are used in only 20-30% of proceedings.This causes, among other things, problems in access to the public procurement market for foreign contractors.A different approach can be observed in Belgium, Bulgaria, Denmark, Finland, Ireland, and the Netherlands, which all belong to one cluster.Although the open procedure is not the most commonly used here, the other procedures are in line with those outlined in the Directive.
The various procurement procedures have both advantages and disadvantages.It is difficult to point to one optimal procedure.Procedures must be tailored to the specifics of the contracts.EU countries are adopting different strategies here.Knowing the advantages and disadvantages of the different procedures, as well as the countries' strategies in terms of public procurement, can enable streamlining and improve the public procurement system in a country.
Funding: This research received no external funding.

Figure 1 .
Figure 1.Steps in contractor and tender selection.

Figure 1 .
Figure 1.Steps in contractor and tender selection.

Figure 3 .
Figure 3. Stages in restricted procedure.Figure 3. Stages in restricted procedure.

Figure 3 .
Figure 3. Stages in restricted procedure.Figure 3. Stages in restricted procedure.

Figure 4 .
Figure 4. Stages in negotiated procedure with a prior call for competition.

Figure 4 .
Figure 4. Stages in negotiated procedure with a prior call for competition.

Figure 4 .
Figure 4. Stages in negotiated procedure with a prior call for competition.

Figure 6 .
Figure 6.Stages in negotiated procedure without a prior call for competition.

Figure 6 .
Figure 6.Stages in negotiated procedure without a prior call for competition.

Figure 7 .
Figure 7.The percentage share of open and restricted procedures in individual EU countries.

Figure 7 .
Figure 7.The percentage share of open and restricted procedures in individual EU countries.

Figure 7 .
Figure 7.The percentage share of open and restricted procedures in individual EU countries.

Table 1 .
Literature summary table.

Table 2 .
Public procurement for construction work in EU countries.

Table 2 .
Public procurement for construction work in EU countries.

Table 3 .
Statistical data on construction contracts in EU countries in 2022.

Table 5 .
The results of cluster analysis-k-means clustering method.