Open tenders: this type of public tender is open to all tenderers who meet the selection criteria. Bidders may submit their bid in accordance with the requirements of the tender. Open tenders are commonly used for large contracts.

Restricted calls for tenders: this type of public contract is reserved for a restricted group of pre-selected bidders. Shortlisted bidders are invited to submit their bid in accordance with the requirements of the tender. Restricted tenders are often used for medium-sized contracts.

Negotiations: This type of procurement allows contracting authorities to negotiate with bidders to finalize contract details. Negotiations may relate to the technical, legal and financial aspects of the contract. Negotiations are often used for large and complex contracts.

Simplified public procurement: this type of public procurement is used for low-value purchases and is subject to simplified procedural rules. Simplified public procurement allows contracting authorities to quickly make purchases of common goods or services without having to go through more formal tendering procedures.

There are also other types of public procurement, such as competitive bidding with negotiation, public partnership procurement, framework agreements, etc. The choice of procurement type will depend on the nature and complexity of the contract, as well as the specific requirements of the contracting authority.