sexual or other exploitation or abuse, or any wrongful conduct of the contractor or a related person  which has an impact on its professional credibility where such conduct denotes wrongful intent or  gross negligence.  ‘Interface control document’ : the guideline document which lays down the technical specifications,  message standards, security standards, checks of syntax and semantics, etc. to facilitate machine-to- machine connection. This document is updated on a regular basis; ‘Irregularity’ : any infringement of a provision of Union law resulting from an act or omission by an  economic oper ator, which has, or would have, the effect of prejudicing the Union’s budget ;  ‘Notification’  (or ‘notify’): form of communication between the parties made in writing including by  electronic means; ‘Performance of the contract’ : the execution of tasks and delivery of the purchased services by the  contractor to the contracting authority; ‘Personnel’ : persons employed directly or indirectly or contracted by the contractor to perform the  contract;  ‘Personal Data’ :  any information relating to an identified  or identifiable natural person (‘data  subject’); an identifiable natural person is one who can be identified, directly or indirectly, in particular  by reference to an identifier such as a name, an identification number, location data, an online  identifier or to one or more factors specific to the physical, physiological, genetic, mental, economic,  cultural or social identity of that natural person.  ‘Personal  Data processing ’:  any operation or set of operations which is performed on personal data  or on sets of personal data, whether or not by automated means, such as collection, recording,  organisation, structuring, storage, adaptation or alteration, retrieval, consultation, use, disclosure by  transmission, dissemination or otherwise making available, alignment or combination, restriction,  erasure or destruction;  ‘Pre - existing material’ : any material, document, technology or know-how which exists prior to the  contractor using it for the production of a  result  in the  performance of the contract ; ‘Pre -exi sting right’ : any industrial and intellectual property right on  pre-existing material ; it may  consist in a right of ownership, a licence right and/or right of use belonging to the contractor, the  creator , the contracting authority as well as to any other third parties;  ‘Professional conflicting interest’ : a situation in which the contractor’s previous or on -going  professional activities affect its capacity to perform the contract to an appropriate quality standard; ‘Related person’ : any natural or legal person who is a member of the administrative, management  or supervisory body of the contractor, or who has powers of representation, decision or control with  regard to the contractor;  ‘Result’ : any intended outcome of the  performance of the contract , whatever its form or nature. A  result  may be further defined in this contract as a deliverable. A  result  may, in addition to newly  created materials produced specifically for the contracting authority by the contractor or at its request,  also include  pre-existing materials ;  ‘Supplier portal’ : the  e-PRIOR  portal, which allows the contractor to exchange electronic business  documents, such as invoices, through a graphical user interface.  15 