Project Management tools and techniques are simply the process of coordinating the contractor's resources to achieve the Employer's Target. Each project has its own level of project management tailored to the project unique case. In project initiation stage, various inputs drive the main project key assumptions relevant to Project Scope, Duration, Cost and Stakeholders. Those same assumptions could impose a reason for the contractor not to meet project completion date and to be titled as causes of delay or Delay Events. Some of you might understand that since the topic is Time Extension Claim, so we focus on project timeline, this is correct, and within this, we will explain why the Project Programme of Work (Baseline) where assigned resources, cost, quantities, and sequence of work will drive Project Progress need to be agreed. Regardless the debate of whither or whither-not, the Baseline is a contractual document, and it requires approval or not, this paper assumes that; the contractor has signed the contract, secured approved programme, and managed to follow all contract clauses to submit a proper extension of time claim. Hence, he/she is concerned about the Contract Administrator action upon receiving this claim, methods of delay analysis, and determination report contents.