Identification and quantification of project complexity from perspective of primary stakeholders in us construction projects

Construction experts believe that complexity could adversely affect construction projects’ performance. Several studies have been focused on identifying leading complexity indicators; however, the complexity indicators from the perspective of primary stakeholders (owners, contractors, and consultants) have been rarely studied. Therefore, the aim of this study is to utilize the systematic Delphi method to identify, rank and weight the complexity indicators based on the primary stakeholders’ perspectives associated with US construction projects. Additionally, the shared entity-based complexity indicators (ECIs), as well as the weighting of entity-based complexity categories were determined and analyzed. Therefore, 101 potential ECIs were identified through a comprehensive literature review. Then, thirteen senior subject matter experts (SMEs), and three academic advisors were selected and invited to participate in a workshop to determine significant ECIs and then rank and weight them. The results reveal that the ECIs associated with complexity categories “scope definition” and “project resources” received the highest aggregated complexity weights in the aspect of the primary stakeholders. Although this study has been conducted based on US construction projects, the results would provide helpful guidance for international construction projects. Moreover, this study would assist the primary stakeholders in allocating resources properly in order to manage project complexity worldwide

A Review of Nontraditional Teaching Methods: Flipped Classroom, Gamification, Case Study, Self-Learning, and Social Media

Traditional teaching methods rely solely on the use of textbooks, but teaching effectiveness assessment methods have demonstrated that most students taught by this method do not absorb the course content up to the expected level. Multiple researchers have introduced nontraditional teaching methods, but there is no scientific consensus on the best nontraditional teaching methods that are tailored to learners’ abilities while most effectively addressing the course objectives. Therefore, the goal of this review was to address the following questions across all engineering disciplines, based on learners’ abilities and the course objectives: (a) What are the benefits of nontraditional teaching methods? and (b) How would you categorize the benefits of nontraditional teaching methods? A qualitative review was conducted to achieve these goals, and the initial search for papers, using relevant keywords, resulted in more than 2000 peer-reviewed articles that were published between 2000 and 2017. A total of 125 peer-reviewed articles pertaining to the most frequently studied nontraditional teaching methods were comprehensively studied and analyzed. The analysis resulted in practical guidelines, including a list of the benefits of the five studied nontraditional teaching methods (flipped classroom, gamification, case study, self-learning, and social media) belonging to four categories: technical/professional, personal skills/ability, personal attitude, and time and space. Based on the results, the authors established significant guidelines for instructors who aim to optimize learners’ achievements by adopting the most effective teaching styles, based on their course objectives and the learners’ abilities

Study of Design and Construction of Transit Facilities in Rural Areas in USA

The United States rural transit facilities have a considerable impact on annual transportation expenditures as there are many of them and they are geographically dispersed. It is challenging to estimate the design and construction costs of the facilities, as the historical and documented cost database is insufficient; therefore, the ultimate aim of this study was to establish a baseline estimate for design and construction costs. Additionally, the key information associated with the different aspects of rural transit facility projects was also provided in this study. Interviews were conducted with professional managers of different departments of transportation (DOTs) who were involved in rural transit projects. A structured survey was then developed and distributed to various DOT representatives, and 26 of them were completed and returned. Two regression models were generated by utilizing the survey data to predict the design and construction costs of rural transit facilities, based on the size of the projects. Furthermore, the results revealed that issues arising from soil conditions and unexpected underground conditions are frequently risk factors for construction of transit facilities. It was also concluded that the popular approach to estimating the cost of the design and construction phases associated with transit facility projects is to use the data from similar projects. These findings support the need for additional literature to provide a baseline estimate for design and construction costs and key information of different important aspects of rural transit facilities

Selection of Best Practices that Enhance Phase-Based Cost and Schedule Performances in Complex Construction Projects

A common assumption made by construction professionals is that complex projects are more likely than simple ones to entail cost overruns and delays. Although several researchers have studied the critical causes of complexity and have identified their indicators (CIs), few of them have investigated how they actually impact a project’s schedule and cost performance during the design, procurement, and construction phases. This research aimed to study the impact of each CI and determine the most effective best practices (BPs) for preventing it. Data from 44 case studies were collected and analyzed, and the results revealed that implementing the BPs of team building, front-end planning (FEP), constructability, alignment, partnering, and change management significantly reduces cost overruns and delays in all three phases of complex construction projects and, in fact, can improve the cost and schedule performance, due to fewer complex challenges. The outcomes of this research will help project managers identify the challenges that stem from complex aspects of projects and lead to phase-base cost overruns and time delays. They will also assist decision-makers in deciding which are the most effective BPs for mitigating challenges stemming from the characteristics that make projects complex and will them improve phase-based cost and schedule performance in complex construction projects

Resilience in Water Infrastructures: A Review of Challenges and Adoption Strategies

An increase in the number and strength of natural catastrophes experienced over the past few decades has accelerated the damage sustained by infrastructures. Drinking water and wastewater infrastructure systems are critical aspects of a healthy environment, and their ability to withstand disasters is vital for effective disaster response and recovery. Although numerous studies have been conducted to determine the challenges that natural disasters render to water infrastructures, few extensive examinations of these challenges have been conducted. The goal of this study, therefore, was to identify and categorize the challenges related to the resilience of drinking water and wastewater infrastructures, and to determine the strategies that most effectively minimize their unintended consequences. A comprehensive evaluation of the existing literature was conducted, and 537 publications were collected. After extensive screening, 222 publications were selected for rigorous evaluation and analysis based on the data collection methods and other criteria. A total of fifty-one (51) challenges were determined and classified, within the following five categories: environmental, technical and infrastructure, social, organizational, and financial and economic. The challenges were then ranked within each category according to their frequency of occurrence in previous research. The results reveal that climate change, aging infrastructure, lack of infrastructure capital, population growth, improper maintenance of water infrastructure, and rapid urbanization are the most frequently cited challenges. Next, 30 strategies and approaches were identified and categorized into either preventive or corrective actions, according to their implementation time. The findings of this study will help decision- and policymakers properly allocate their limited funding to enhance the robustness of their water infrastructures before, during, and after natural hazards

Identification of Schedule-Performance Indicators and Delay-Recovery Strategies for Low-Cost Housing Projects

Many construction projects suffer from schedule delays that ultimately lead to considerable cost overruns and defeat the purpose of low-cost housing (LCH), which is to support low-income earners. It is, therefore, vital that the schedule delays and cost overruns be minimized. The objectives of this research were to investigate, identify, and classify the schedule-delay indicators (SDIs), prioritize them based on their level of impact, and formulate constructive strategies to improve the schedule performance. To achieve the objectives set forth, 68 interviews were conducted with professionals who are active in LCH projects, and a structured survey was developed and distributed to other experts involved in LCH projects to validate the result of the interviews and collect additional data. Survey responses were collected from 101 individuals and were analyzed. The significant SDIs were identified and classified by the research team and were ranked and prioritized, using the Relative Importance Index (RII) method. The results demonstrated that the identified SDIs could be classified into the following eight main categories: legal, design and technology, project characteristic, project management, material resource, human resource, location, and finance. The outcomes of this study will help project managers and stakeholders identify the causes of schedule delays early in the project and implement effective strategies for improving project performance in low-cost housing projects