【正文】 , the reactor, the extruder etc. Notwithstanding to what is expected, the installation of the equipment is not crucial for the fabrication or even the erection of the large bore pipes because the location of the large bore pipes on site is in accordance to the drawings and not with the final position of the equipment and it is not required in any specification the prior installation of the equipment, on the contrary the small bore pipes have to be located after the installation of the equipment, because their exact position and alignment with the equipment (especially with those having rotary parts, such as the pumps and the pressors) and it has always to be checked in the field prior to their erection.Furthermore, there are dozens of other similar prerequisites that an experienced project management and planning team should have taken into account during the issue of the planning schedule of the project and follow closely during the whole construction phase.It should be noticed here also the following: Engineer was drawing on Contractor’s resources to assist Engineer in its premature activities. Furthermore, extensive modifications were executed to Contractor’s pleted works by Engineer’s missioning team and other subcontractors, without notice to Contractor and without its consent. The earlier mencement of Engineer’s premissioning and missioning activities unveiled numerous problems in Engineer’s engineering that led to instructions for changes, even to tested sections of Works. the activities that were taking place in one area were not critical for the start of the activities in another area until the mechanical pletion of the works.Coclusions: Problems that created delays and disruption to the progress of the works.Premature start of premissioning and missioning activities had detrimental consequences and caused extensive delay and disruption to Contractor’s works: Installation of Junction Boxes, DCS, Cabinets, erection of instruments, wiring on control room etc. Erection of large bore piping. Prefabrication of large bore Piping (pipes with more than 2 inches diameter). Mobilization on site, Interconnecting Pipe racks (ISBL Area) Utilities Area Sea Platform Histogram Decision Matrix Plan–Do–Check–Act CycleProject Quality Management in ConstructionModern construction project management has incorporated quality management principles and initiatives in their activities. Modern quality management systems such as ISO 9000 series of standards require incessant monitoring of construction processes. This presentation attempts to consolidate key quality management tools to a real, large and plex building project that took place in Athens, Greece by a wellknown works contractor. Detailed analysis provides opportunities for improvements in costing and time deadline issues. Critical areas were studied by WBS and functional unit analysis focused in the main activities.Problem solving was achieved mainly by a bination of brainstorming sessions, Fishbone diagrams and Pareto analysis. A proposal for improving future projects has been concluded on forecasting procedures, stage planning and management staffing.IntroductionIt is mon for a construction project to encounter delays. There are several reasons that can contribute to delaying a project. Analyzing the various causes that contribute to a project’s delay is an important task to resolving it. Determining, in a scientific manner, the impact, timing, and the contributing effect of each of those causes to the overall delay should assist in helping the parties settle the delay without litigation. The aim of this thesis is twofold. One is the definition and analysis of the main factors which cause delays in a project. And the other is to analyze the construction schedule delay considering the numerous factors in order to figure out possible ways of eliminate these factors that caused these delays.Delays and claimsDelays are among the most mon phenomena in the construction industry. During the last three decades delays have occurred in most types of projects, from simple building projects to the most plex projects such as nuclear power plants or tunnelling works. Delays on construction projects, and the claims which emanate from such delays, are an integral part of the modern construction process. The overwhelming amount of time, energy, and cost devoted to delay claims does not begin when a claim is initially submitted at or near the pletion of a job, rather, the construction delay claim process mences at project inception. A delay claim often occurs when a difference between the actual pletion date and the contract pletion date exists. The duration of a delay is an essential piece of information required for determining the cause of a delay. However, it is difficult to analyze a delay claim due to the fact that numerous factors that cause this delay, thereby making it a v