Construction analysis: The Employer’s power to instruct, under the Joint Contracts Tribunals (JCT) forms of contract, is often taken for granted. However, there may be more to this subject than first appears. In this article, James Ladner, legal director, and Fiona Fingland, associate, at Pinsent Masons, consider the basis for and scope of the Employer’s power to instruct under the JCT Design and Build Contract, the limitations of the power to instruct, and the consequences of the parties’ failures to deal with instructions in accordance with the terms of the contract.