text: I.4.2. Period of provision of the services 
  
  The period for the provision of the services starts to run from the date on which the specific 
  contract is signed by the last party. 
  
  I.4.3. Implementation of FWC in cascade 
  
  The FWC is implemented as follows: the contracting authority orders services by sending 
  a request for offer for a specific contract to the contractor who is ranked first in the cascade. 
  
  Within 5 working days (unless otherwise stated in the request for offer), the contractor 
  must either: 
  
  (a) send the specific tender back to the contracting authority; or 
  (b) send an explanation of why it cannot accept the order. 
  
  If the contractor does not accept the order or fails to observe the deadline or to submit an 
  acceptable offer for the Agency, or if it is in a situation of conflicting interests that may 
  negatively affect the*performance of the specific contract*(see Article II.7), the contracting 
  authority may place the order with the next contractor on the cascade. 
  
  If the contractor repeatedly refuses to accept requests for offer or repeatedly fails to send 
  them back on time, the contractor may be considered in breach of its obligations under 
  this FWC as set out in Article II.18.1 (c). 