Delay Hierarchy Propagation Model (original) (raw)
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These days, one of the biggest problems that companies and organizations are faced with is that their projects take longer than the scheduled duration. An effective method to improve the stability of project scheduling is to consider buffers to cope with time changes of projects using the critical chain method. To increase safety in project implementation and factories production in the face of possible and unpredictable events, time buffers will be placed in different parts of projects and activities to prevent the negative effects of fluctuations in activities on the project's critical chain which will otherwise lead to a delay in the whole project. Three types of buffers are used, called the Project Buffer, Feeding Buffer, and Resource Buffer (Vanhoucke et al., 2016). The project buffer is placed at the end of the project's critical chain to maintain the project delivery date (Goldratt, 1997). Buffer management can be considered as the most important measure in implementing the critical chain scheduling, because if short buffers are allotted, we will need to reschedule the project repeatedly until the end of the project, and if long buffers are allotted, all concepts used in scheduling will be violated (Zohrehvandi et al., 2020). According to an extensive study by Hall (2015), project scheduling and project buffer management are among research areas with a high research potential for the next 10 years. The critical chain project management (CCPM) technique improves the accuracy of project plans by addressing variations by considering buffers in the project schedule. CCPM was originally proposed by Goldratt (1997) in an attempt to improve the traditional methods of project management using a new mechanism to manage uncertainties. The Theory of Constraints (TOC) and the critical chain/buffer management are two effective approaches in project management (Goldratt, 1984). Since the introduction of the TOC, several researchers have examined its
Delay analysis for construction projects
The completion of any project in its period of time, which listed in the contract is one of the most difficult matter, that can not be achieved unless several activities must be done during the project life cycle. The main factors that affected the delay in project completion are investigated in this study, taking into account the circumstances of each factor relative to the other. The direct investigation, interviews with the team of project ( design, in situ office, consultant ) and the questionnaire methodologies was used to collect data about the project stages and problems. The study illustrate the main factors that causes delay in project completion, the extreme item was finance related, building materials related and project management related factors. The rate of them to total delay were 22 %, 18.4 % and 14.7 % respectively, and total delay caused by them was 55.1 % of total project delay. In finance the critical value was of delay in payment, weather; in the building materials the critical one was of the delay in supplying materials, while for the project management item the risk was in the fail in the in situ management.
2012
Delays are one of the biggest problems facing by the construction industry and they have significant financial and social impact in construction projects. The paper presents a framework of Delay Analysis System (DAS) with the aim of analysing the impact of delay factors in Libyan construction projects. The system has designed by integrating the possible delay factors, critical activities of a project using @ risk simulator. A case study of building project was demonstrated to identify the impact of delays and the sensitivity of delay factor. The case study result showed that the project might be delayed by 97 to 103 days in comparison to the planned duration. The developed DAS is a tool for analysing and identify the impacts of delay factors and assist to construction manager to take necessary measure in reducing the delay impact. The paper provides a methodology for analysing the possible delay impact in a construction project and informing to construction manager in advance of the possible delay factors.
Delay Hierarchy Propagation Model By
2005
Construction projects are always exposed to delay. Research has shown that most projects encounter delays and this problem is a global one. Previous research related to delays in construction projects have been dedicated to measuring and ranking the direct delays that have occurred. These types of delay are past delays and have already affected many aspects of the project's performance. This type of research is of the reactive type and handles delays after they have happened. The objective of this research is to model the construction project delays that can be used to predict the level of delays that the project could face during its future life. The proposed Delay Hierarchy Propagation Model (DHPM) is the first attempt to model delays in the construction project. This model is an innovative predictive approach to anticipate the future encountered delays before they become real. The model assumes that the direct delay is generated from earlier events or aspects that are found ...
IRJET- DELAY ANALYSIS OF A CONSTRUCTION PROJECT-A CASE STUDY
IRJET, 2020
Construction technology has become an essential part of any of the project, for timely and economical completion of the project. A proper construction planning and schedule acts as a main role ford different purposes. By using the schedule, we can know the merely completion of the project, contractors can recruit the necessary manpower; can demand shifts or equipments to speed up the project. The most important function of the project management is to plan and control the project objective like time, budget and setting out of resource productivity standards to achieve the objectives of the project. Delay happens in all construction projects. Where construction project will vary in size, some will be in small. In vast projects, analysis should be done for the purpose on making right decisions on time and cost compensation claims. Many type of software's are available to plan, execute and control the project; with the help of these software's the project management has become easier to evolve the construction project. Large quantities of different kind of resources are required for execution and the risk is more in case of big projects. So, planning and scheduling in big projects is essential. In this study, an effort is made in planning, scheduling and delay analysis and updating of various activities which is done using MS project.
A Quantity-Based Method to Predict More Accurate Project Completion Time
KSCE Journal of Civil Engineering
schedule delays when the costs of non-critical activities are much higher than those of the activities on the critical path (Khamooshi and Golafshani, 2014). EDM may fail to detect a change in the critical path (CP) when there are parallel paths with small floats (Vanhoucke, 2009; Elshaer, 2013). These weaknesses result in incorrect schedule performance indices, such as the cost-based schedule performance index (SPI c) for the EVM, the time-based schedule performance index (SPI t) for the ESM and the duration-based schedule performance indices for the EDM: the earned duration index (EDI) and the duration performance index (DPI). These inappropriate schedule performance indices result in incorrect PCTE (Anbari,