328. Ascertaining the amount of an interim certificate.

It depends upon the terms of the contract whether the certifier is to take into account not only the value of work done but also the value of the contractor's materials and plant1. The certifier may be required, or be given discretion, to include the value of materials intended for incorporation in the works not yet brought onto the site. Where the architect or engineer is required to value work done, it is submitted that 'value' means the proportion that the work done bears to the value of the contract as a whole; the cost to the contractor is