The so-called FIDIC Books made by the International Federation of Consulting Engineers provides different contract samples for construction projects, depending on the type of the project, with the primary aim of summarising best practice and proportionate risk-sharing. FIDIC Books are considered to be the most popular body of law worldwide in connection with construction projects. The Yellow Book is the second most commonly used contract sample, the essence of which is that the contractor’s obligation covers both planning and building. The Yellow Book applies the legal principles and legal institutions of the Anglo-Saxon legal system, which implies that the application of the contract sample in a continental legal context raises several problems regarding to interpretation and application. After an introduction to the interpretation of the Yellow Book in the continental legal context, the study deals with the question of the contractor's liability for damages arising from delay. The author focuses on cases where the delay of the contractor is caused by the principal. In this context, the author outlines a concrete proposal for the application of the law.