ECHA/2020/666  Annex 1 to Tender Specifications  Technical Specifications Restricted  66 (77) (performing subsequent stages of work) to be executed, the Agency will perform an  overall final acceptance test of all deliverables as a whole after the completion of the  sequence of all specific contracts. For this reason, and as provided for in Art. I.6.4. of the  FWC666, ECHA reserves the right to require a performance guarantee to ensure proper  fulfilment of a specific contract after its final payment and until the  overall  acceptance of  the final software product. This guarantee would be required at the end of that specific  contract, i.e. just before its final payment.  Handover and takeover are progressive activities, meaning that final acceptance can only  happen after the successful achievement of a set of tasks detailed in the Transitioning  across lots: Takeover (WP 3) and Transitioning across lots: Handover (WP 4) sections.  Each phase of the handover/takeover (knowledge transfer, shadowing, reverse  shadowing) will require an interim acceptance in order to start the next one or to perform  the final acceptance. The acceptance of the handover / takeover plans, knowledge management artefacts and  other deliverables included in the handover and takeover work packages will follow the  process indicated in the section 6.3.4 Acceptance of other services below.  ECHA will perform a regular (weekly by default) validation of the progress of the handover  / takeover, in which the Contractor responsible for the handover will list the items  presented / developed, and the taking over Contractor will confirm the correct  understanding / performance, - for ECHA to validate -, or the pending issues and their  cause, so to address them and avoid them for happening in the future. The progress validation from ECHA will lead to the acceptance of each phase and initiate  the next one or perform the final acceptance.  No handover or takeover is accepted by default. When the responsibility of a delay in the  review process is clearly identified on the Agency side, the contractor must alert the  Agency. Contractors shall pay the outmost attention to ensure that during transitioning activities  all parties requests are adequately fulfilled (timely and at the agreed level of quality). Any  issue or delay shall be immediately and adequately presented to ECHA. With regard to the above, ECHA reserves the right to not proceed to final acceptance of  the contractors’ assignment s until any issues or delay that may affect the successful  closure of the transitioning activities is resolved. In this regard, whereas ECHA shall  facilitate the resolution of any such issues the contractors shall ensure that collaboration  failures are minimised, and the risks mitigated in order not to affect the quality of the  service delivery. Following final acceptance, the Agency will issue a documented statement or certificate of  acceptance.  Taking into account the critical nature of the service in scope and the need for ECHA to  guarantee a certain degree of business continuity while transitioning from the existing  Framework Contracts to FWC666 (phase-in) and when phasing out from FWC666, the  contractor carrying out phase-in and phase-out activities (in particular the first contractor  in Lot 2) will be subject to specific acceptance conditions. These can also be defined at the  level of single product and/or service. In order to monitor the quality of the service delivered, ECHA will define a number of  review stages for phase-in/phase-out activities to serve as:  6.3.3. Acceptance of handover and takeover  6.3.3.1. Acceptance of FWC666 phase-in and phase out  P.O. Box 400, FI-00121 Helsinki, Finland | Tel. +358 9 686180 | echa.europa.eu 