The Impact Of Change Orders On Mechanical Construction Labor Efficiency
The Impact Of Change Orders On Mechanical Construction Labor Efficiency Book in PDF, ePub and Kindle version is available to download in english. Read online anytime anywhere directly from your device. Click on the download button below to get a free pdf file of The Impact Of Change Orders On Mechanical Construction Labor Efficiency book. This book definitely worth reading, it is an incredibly well-written.
The Impact of Change Orders on Mechanical Construction Labor Efficiency by Paul Joseph Vandenberg Pdf
Change orders impact many areas of construction projects. However, the impacts that change orders have on labor efficiency are much harder to quantify and are, therefore, a significant risk to contractors. Little research has been completed in the past quantifying these impacts so that disputes are common between owners and contractors regarding the actual cost of change. This study uses data from 43 projects, 27 impacted by changes and 16 not impacted by changes, to develop a linear regression model that predicts the impact on labor efficiency. The input factors needed for the model are: (1) Total Actual Project Hours, (2) Total Estimated Change Hours, (3) Impact Classification, and (4) Timing of Change. Timing of Change is calculated by breaking the project schedule down into six periods (i.e., changes before construction start, 0 - 20%, 20 - 40%, 40 - 60%A, 60 - 80%, and 80 - 100%), listing the percentage of change that occurred in each period, and calculating a weighted timing factor. The model calculates the labor loss or gain in efficiency for a particular project so that owners and contractors will better understand the true change impact on labor efficiency. Significant results have been found in hypothesis testing. The results show that impacted projects have larger amounts of change, have a larger decrease in labor efficiency, and are more impacted by change that occurs later in the project schedule. These results appear to be consistent with the intuitive judgement of industry professionals. The research is limited to the mechanical trade, but does include specific work in plumbing, HVAC, process piping, and fire protection.
Quantitative and Qualitative Approaches to Determine Cumulative Impact of Change on Mechanical and Electrical Labor Productivity by Joel Phillip Dettwiler Pdf
Quantitative and Qualitative Approaches to Determine Cumulative Impact of Change on Mechanical and Electrical Labor Productivity by Pehr Anthony Peterson Pdf
Calculating Construction Damages by William Schwartzkopf,John J. McNamara Pdf
Calculating construction damages can be complex and confusing. Written by recognized experts in the area of construction claims, Aspen Publishersand’ Calculating Construction Damages is a one-of-a-kind resource providing step-by-step guidelines for valuing a claim and calculating damages. Calculating Construction Damages keeps you completely up-to-date with the changes in the construction industry, and provides new and updated coverage on: Reductions in scope through deductive changes The meaning and explanation of acceleration The use of the actual cost method and the total cost method to calculate damages The effectiveness of expanding on productivity analysis. The definition of home office overhead costs and the use of the Eichleay formula. The most recent assessment of attorneysand’ fees on Miller Act claims Only Aspen Publishersand’ Calculating Construction Damages leads you through every step you need to take in order to reach an accurate assessment of construction damages. Complete coverage includes: General Principles of Damage Calculation Labor Costs Equipment and Small Tool Costs; Additional Equipment Costs Material Costs Bond and Insurance Costs Home Office Overhead Calculating Construction Damages is organized by type of damage rather than type of claim. Its clear, mathematical techniques will enable you to value any claim and accurately calculate damages.
Design Economics for the Built Environment by Herbert Robinson,Barry Symonds,Barry Gilbertson,Ben Ilozor Pdf
The drive towards environmentally friendly buildings and infrastructure has led to a growing interest in providing design solutions underpinned by the core principles of sustainability to balance economic, social and environmental factors. Design Economics for the Built Environment: Impact of sustainability on project evaluation presents new directions, reflecting the need to recognise the impact of climate change and the importance of sustainability in project evaluation. The aim is to provide a new approach to understanding design economics in the context of the changing policy environment, legislative and regulatory framework, and increasing economic, environmental and social pressure as result of the sustainability agenda. The book follows a structured approach from theories and principles in the earlier chapters, to the practical applications and emerging techniques focusing on value and social, economic and environmental considerations in making design decisions. It starts with the policy context, building on various theories and principles such as, capital cost, value of design and resource-based theories, the new rules of measurement (NRM) to explore cost planning, the relationship between height and costs, key socio-economic and environmental variables for design appraisal, eco-cost/value ratio (EVR), whole life theory and the treatment of carbon emission as external costs, productivity and efficiency, fiscal drivers and legal framework for carbon reduction, procurement and allocation of risks in contracts. Case studies, practical examples and frameworks throughout reinforce theories and principles and relate them to current practice. The book is essential reading for postgraduate students in architecture, building and quantity surveying and is also a valuable resource for academics, consultants and policy-makers in the built environment.
Author : Peter W. G. Morris,Jeffrey K. Pinto Publisher : John Wiley & Sons Page : 422 pages File Size : 40,8 Mb Release : 2007-09-21 Category : Technology & Engineering ISBN : 9780470226827
The Wiley Guide to Project Technology, Supply Chain, and Procurement Management by Peter W. G. Morris,Jeffrey K. Pinto Pdf
A complete guide to managing technical issues and procuring third-party resources The Wiley Guides to the Management of Projects address critical, need-to-know information that will help professionals successfully manage projects in most businesses and help students learn the best practices of the industry. They contain not only well-known and widely used basic project management practices but also the newest and most cutting-edge concepts in the broader theory and practice of managing projects. This fourth volume in the series offers expert guidance on the supply chain and delivery cycle of the project, as well as the technology management issues that are involved such as modeling, design, and verification. Technology within the context of the management of projects involves not so much actually doing the "technical" elements of the project as managing the processes and practices by which projects are transformed from concepts into actual entities-and doing this effectively within the time, cost, strategic, and other constraints on the project. The contributors to this volume, among the most recognized international leaders in the field, guide you through the key life-cycle issues that define the project, ensure its viability, manage requirements, and track changes-highlighting the key steps along the way in transforming and realizing the technical definition of the project. Complete your understanding of project management with these other books in The Wiley Guides to the Management of Projects series: * The Wiley Guide to Project Control * The Wiley Guide to Project, Program & Portfolio Management * The Wiley Guide to Project Organization & Project Management Competencies
Structural & Construction Conf by Franco Bontempi Pdf
Objective of conference is to define knowledge and technologies needed to design and develop project processes and to produce high-quality, competitive, environment- and consumer-friendly structures and constructed facilities. This goal is clearly related to the development and (re)-use of quality materials, to excellence in construction management and to reliable measurement and testing methods.
Optimization and Control Methods in Industrial Engineering and Construction by Honglei Xu,Xiangyu Wang Pdf
This book presents recent advances in optimization and control methods with applications to industrial engineering and construction management. It consists of 15 chapters authored by recognized experts in a variety of fields including control and operation research, industrial engineering and project management. Topics include numerical methods in unconstrained optimization, robust optimal control problems, set splitting problems, optimum confidence interval analysis, a monitoring networks optimization survey, distributed fault detection, nonferrous industrial optimization approaches, neural networks in traffic flows, economic scheduling of CCHP systems, a project scheduling optimization survey, lean and agile construction project management, practical construction projects in Hong Kong, dynamic project management, production control in PC4P and target contracts optimization. The book offers a valuable reference work for scientists, engineers, researchers and practitioners in industrial engineering and construction management.
An Introduction to Project Modeling and Planning by Gündüz Ulusoy,Öncü Hazır Pdf
This textbook teaches the basic concepts and methods of project management but also explains how to convert them to useful results in practice. Project management offers a promising working area for theoretical and practical applications, and developing software and decision support systems (DSS). This book specifically focuses on project planning and control, with an emphasis on mathematical modeling. Models and algorithms establish a good starting point for students to study the relevant literature and support pursuing academic work in related fields. The book provides an introduction to theoretical concepts, and it also provides detailed explanations, application examples, and case studies that deal with real-life problems. The chapter topics include questions that underlie critical thinking, interpretation, analytics, and making comparisons. Learning outcomes are defined and the content of the book is structured following these goals. Chapter 1 begins by introducing the basic concepts, methods, and processes of project management. This Chapter constitutes the base for defining and modeling project management problems. Chapter 2 explores the fundamentals of organizing and managing projects from an organization’s perspective. Issues related to project team formation, the role of project managers, and organization types are discussed. Chapter 3 is devoted to project planning and network modeling of projects, covering fundamental concepts such as project scope, Work Breakdown Structure (WBS), Organizational Breakdown Structure (OBS), Cost Breakdown Structure (CBS), project network modeling, activity duration, and cost estimating, activity-based costing (ABC), data and knowledge management. Chapter 4 introduces deterministic scheduling models, which can be used in constructing the time schedules. Models employing time-based and finance-based objectives are introduced. The CPM is covered. The unconstrained version of maximizing Net Present Value (NPV) is also treated here together with the case of time-dependent cash flows. Chapter 5 focuses on the time/cost trade-off problem, explaining how to reduce the duration of some of the activities and therefore reduce the project duration at the expense of additional costs. This topic is addressed for both continuous and discrete cases. Chapter 6 discusses models and methods of scheduling under uncertain activity durations. PERT is introduced for minimizing the expected project duration and extended to the PERT-Costing method for minimizing the expected project cost. Simulation is presented as another approach for dealing with the uncertainty in activity durations and costs. To demonstrate the use of the PERT, a case study on constructing an earthquake-resistant residential house is presented. Classifications of resource and schedule types are given in Chapter 7, and exact and heuristic solution procedures for the single- and multi-mode resource constrained project scheduling problem (RCPSP) are presented. The objective of maximizing NPV under resource constraints is addressed, and the capital-constrained project scheduling model is introduced. In Chapter 8, resource leveling, and further resource management problems are introduced. Total adjustment cost and resource availability cost problems are introduced. Various exact models are investigated. A heuristic solution procedure for the resource leveling problem is presented in detail. Also, resource portfolio management policies and the resource portfolio management problem are discussed. A case study on resource leveling dealing with the annual audit project of a major corporation is presented. Project contract types and payment schedules constitute the topics of Chapter 9. Contracts are legal documents reflecting the results of some form of client-contractor negotiations and sometimes of a bidding process, which deserve closer attention. Identification and allocation of risk in contracts, project control issues, disputes, and resolution management are further topics covered in this Chapter. A bidding model is presented to investigate client-contractor negotiations and the bidding process from different aspects. Chapter 10 focuses on processes and methods for project monitoring and control. Earned Value Management is studied to measure the project performance throughout the life of a project and to estimate the expected project time and cost based on the current status of the project. How to incorporate inflation into the analysis is presented. In Chapter 11, qualitative and quantitative techniques including decision trees, simulation, and software applications are introduced. Risk phases are defined and building a risk register is addressed. An example risk breakdown structure is presented. The design of risk management processes is introduced, and risk response planning strategies are discussed. At the end of the Chapter, the quantitative risk analysis is demonstrated at the hand of a team discussion case study. Chapter 12 covers several models and approaches dealing with various stochastic aspects of the decision environment. Stochastic models, generation of robust schedules, use of reactive and fuzzy approaches are presented. Sensitivity and scenario analysis are introduced. Also, simulation analysis, which is widely used to analyze the impacts of uncertainty on project goals, is presented. Chapter 13 addresses repetitive projects that involve the production or construction of similar units in batches such as railway cars or residential houses. Particularly in the construction industry repetitive projects represent a large portion of the work accomplished in this sector of the economy. A case study on the 50 km section of a motorway project is used for demonstrating the handling of repetitive project management. How best to select one or more of a set of candidate projects to maintain a project portfolio is an important problem for project-based organizations with limited resources. The project selection problem is inherently a multi-objective problem and is treated as such in Chapter 14. Several models and solution techniques are introduced. A multi-objective, multi-period project selection and scheduling model is presented. A case study that addresses a project portfolio selection and scheduling problem for the construction of a set of dams in a region is presented. Finally, Chapter 15 discusses three promising research areas in project management in detail: (i) Sustainability and Project Management, (ii) Project Management in the Era of Big Data, and (iii) the Fourth Industrial Revolution and the New Age Project Management. We elaborate on the importance of sustainability in project management practices, discuss how developments in data analytics might impact project life cycle management, and speculate how the infinite possibilities of the Fourth Industrial Revolution and the new technologies will transform project management practices.
Construction Delay Claims by Barry B. Bramble,Bramble,Michael T. Callahan Pdf
Contracts can be your first line of defense against delays. But they have tobe drafted very carefully. Construction Delay Claims gives youan in-depth analysis of all the pertinent clauses and details what they canand can't do to minimize delays and avoid litigation.Construction Delay Claims, Fourth Edition, by Barry B. Brambleand Michael T. Callahan is written for everyone involved with delay and impactconstruction claims--the most common form of disputes in the constructionindustry. You'll find that this resource presents the most thorough, detailedreview of delay claims liability available, including a complete descriptionof the entire process for filing and pursuing claims along with more than1,950 cases and analyses.Construction Delay Claims gives you the information you need todetermine your best course of action. The book presents detailed knowledgedrawn from the authors' thirty-five years of experience in the industry.You'll learn how to anticipate delays and mitigate damages through the use ofadvanced planning and immediate responses by the parties involved. You'll alsoreceive helpful instructions about the best use of construction schedules toavert delays, or to prove their impact if they do occur.Construction Delay Claims keeps you completely up-to-date withthe changes in the construction industry, and the construction litigationprocess. Coverage includes:Effective ways to challenge a claimant's use of the Total Cost Method ofCalculationThe effectiveness of "no damages for delay" clausesThe use of ADR methods to resolve delay claimsThe meaning and implication of concurrent delaysCumulative impact effect of multiple change ordersThe impact and probability of delays in design-build, construction management,and multiple prime contractingLatest research into the effect and measurement of lost productivityThe most recent assessments of how states are applying the Eichleayformula
Applying Earned Value Management to Design-Bid-Build Projects to Assess Productivity Disruption by Stephen P. Warhoe Pdf
One of the most important jobs of a project manager is to manage a project's budget and schedule. These tasks can easily be very difficult to accomplish on projects that are complex, especially since successful project execution relies heavily on people who are expected to perform their roles individually and as a team. One of the most difficult aspects of managing projects is estimating how fast and effectively humans will perform a task; that is, determining how productive workers collectively will be each day, each week, or within any time period during the life of a project. Because projects are unique and are typically one-off endeavors, there is usually little previous empirical data to rely upon for the project manager to forecast productivity before or during the project's execution. The crux of the problem lies with adequately identifying not only the labor work flow process, but also the influences that affect the work flow process. When scope changes are introduced into the work flow of a project, the types and number of influences and their cause and effect relationships can significantly increase in numbers. This phenomenon often turns complicated projects into extremely complex ones and the final outcome can be greater than the sum of the individual inputs. For project managers who are unable to get their arms around this very real situation, forecasting the outcome of a project often becomes out of control, especially for projects that are large and heavily labor intensive. This study takes a post-positivist approach to design and builds a system dynamic model with which construction projects that are delivered using the design-bid-build methodology can be simulated to show generically how the influences that affect construction projects can affect worker productivity. No other studies are known to exist that design or build such a model for construction projects that use the design-bid-build delivery method. The model that was designed in the study is based on the works of several academics' works as well as the input of several experts in the construction field, including this study's author. As opposed to attempting to create a simulation model based on the uniqueness of a single project, a "mosaic" approach was used in creating the model in that elements of the model were identified and taken from studies found through the literature review as well as interviews with construction industry experts. The stock and flow structure of the study's model is intended to be a composite of many construction projects and can be used for any project delivered using the design-bid-build methodology. From the research, the model was created and tested using good modeling practice in that the model testing phase followed the process created by one of the pre-eminent system dynamic modelers in the world (refer to Sterman, 2000). The result is a model that simulates the work flow of labor hours in a design-bid-build construction project which can be affected by an immeasurable number of influences that can and do occur on construction projects.