During these early stages contracting authorities should plan in detail how the different stages of the procedure will be conducted, particularly the structure of the dialogue phase, as an Outline Business Case is compiled. The OBC sets out details on potential costs, management of risks and timelines involved in the projects. Contracting authorities are also required to publish a contract notice setting out their needs and requirements, which are defined in the notice itself during this stage. The prequalification of participants, following the expression of interest, is carried out in accordance with the relevant provisions of Articles 44 to 52 of the directive. It aims to identify bidders with the capacity to fulfil the contract. Qualified candidates are then invited to participate in the dialogue phase of the procurement.