You are working in a consultant firm serving a developer in a 15-storey residential tower in Docklands (Ground floor entrance with plant room, 1 storey carpark and 13 storeys typical floor). You are appointed as the contractor administrator of this project. Due to site constraint, this project adopts traditional construction methods relying on the use of in-situ concrete. As of today, the typical flows have been concreted up to 7th-floor slab/ In today's site meeting, the main contractor complained that the material on-site and work done for reinforcement (all measured as firm quantities in the Bills of Quantities) were substantially under-assessed by you in the last payment. By fact, your judgements in the last payment were made as follow: There were 300 tonnes of reinforcement bars, all of them were not bended. The superintendent confirmed that at most 100 tonnes of reinforcement bars can be installed in the upcoming two weeks. You rejected to pay a penny for material on-site. Work done of reinforcement was paid up to 6th floor wall, 7th floor slab has just been concreted and this shouldn't be qualified as 'work done. The main contractor rejected to give the quantities breakdown for checking. You paid nothing