participating in EU calls for tenders or proposals. On registering, each organisation obtains a Participant Identification Code (PIC, 9-digit number) which acts as its unique identifier in the above register. Instructions on how to create a PIC can be found in the PIC-management Quick Guide for Economic Operators. Tenderers already registered in the Participant Register shall reuse their existing PICs when preparing tenders in e-Submission. 

Instructions on how to submit a tender by means of e-Submission can be found in the e- Submission Quick Guide. The tender shall contain the "Request to participate form" duly completed and accompanied by all the information and documents listed in the form. The tender shall be submitted by the deadline indicated in the letter of the invitation to tender. 

In addition, the hand-signed originals of the below documents must be sent by letter  to the contracting authority's postal address indicated under Heading I.1 of the contract notice at the latest on the first working day following the electronic submission of tender: 

 Declaration(s) on honour (template available in the Request to participate form). 

The tender report (a document generated by e-Submission and listing all the documents included in the tender, to be signed by the tenderer or the group leader in case of a joint tender). 

The eTendering site on which all procurement documents are published will be updated regularly and it is the tenderer's responsibility to check for updates and modifications during the tendering period. 

In compliance with the Financial Regulations, the contract value may be increased by up to 50% of the initial contract amount via a negotiated procedure without prior publication of a contract notice in the event of a: 

i. Increase of the cleaning needs; or 

ii. Increase of the staff number of the contracting authority; 

## 4. GROUPS OF ECONOMIC OPERATORS AND SUBCONTRACTING 

Tenders can be submitted by a single economic operator or jointly by two or more economic operators. 

## Joint tender 4.1. 

A joint tender is a situation where a tender is submitted by a group of economic operators; in other words, by several legal entities (natural or legal persons) regardless of the link they may have between them. 

Each individual legal entity of the group shall assume joint and several liabilities with all its resources towards the contracting authority for the fulfilment of the terms and conditions of the contract. 

The group shall nominate one legal entity (‘the leader’) who shall be granted by the other members of the group the full authority to bind the group and each of its members, and who shall be responsible for the administrative management of the contract (including invoicing, receiving payments, etc.) on behalf of all other entities. 

The "Request to participate form" will identify the leader. 

