Towards a semantic Construction Digital Twin: directions for future research

The effects of construction delays on project delivery in Nigerian construction industry

Construction delays are disruptive and expensive. This study assesses the causes of delays by focusing on actions and inactions of project participants and external factors. The study analyzed quantitative data from completed building projects to assess the extent of delays, and data obtained from a postal questionnaire survey of construction managers to assess the extent to which 44 identified factors contributed to overall delays on a typical project they have been involved with. The findings showed that the factors could be prioritized. However, Pareto analysis revealed that 88% of the factors (representing 39 highest priority factors) were responsible for 90% of the overall delays. This suggests that there is no discernable difference among the different delay factors and none really stands out as contributing to a large percentage of the problem. A one-sample t test further confirmed that most of the factors are important contributors to delays. The results suggest the interdependent nature of construction activities and roles of project participants. The overall ranking of the factors and ranking within each factor category provide useful information for construction industry practitioners, policy makers, and researchers when devising ways of combating delays. The results also indicate areas of construction industry practice that require improvement.

Construction delays and their causative factors in Nigeria

Analyzing delay causes in Egyptian construction projects

The time for performance of a project is usually of the essence to the employer and the contractor. This has made it quite imperative for contracting parties to analyse project delays for purposes of making right decisions on potential time and/or cost compensation claims. Over the years, existing delay analysis techniques (DATs) for aiding this decision-making have been helpful but have not succeeded in curbing the high incidence of disputes associated with delay claims resolutions. A major source of the disputes lies with the limitations and capabilities of the techniques in their practical use. Developing a good knowledge of these aspects of the techniques is of paramount importance in understanding the real problematic issues involved and their improvement needs. This paper seeks to develop such knowledge and understanding (as part of a wider research work) via: an evaluation of the most common DATs based on a case study, a review of the key relevant issues often not addressed by the techniques, and the necessary improvements needs. The evaluation confirmed that the various techniques yield different analysis results for the same delay claims scenario, mainly due to their unique application procedures. The issues that are often ignored in the analysis but would also affect delay analysis results are: functionality of the programming software employed for the analysis, resource loading and levelling requirements, resolving concurrent delays, and delay-pacing strategy. Improvement needs by way of incorporating these issues in the analysis and focusing on them in future research work are the key recommendations of the study.

Construction Delay Analysis Techniques—A Review of Application Issues and Improvement Needs

Different categories of delay and the different types of delay found on construction projects are identified. Existing methods for assessing the effect of delaying events are reviewed and the results of an industry survey presented. None of the commonly recognized methods for delay analysis allow the assessment of three important issues at the same time: the progress of the project at the time the delay occurred; the changing nature of the critical path; and the effects of action taken (or that should have been taken) to minimize potential delays. A new method of delay analysis is presented. This method takes into consideration all these issues, and is a clear, straightforward step-by-step approach to the calculation of the expected delay in the completion of the project as a result of delays in activities encountered during the project. It uses a dynamic model considered by both experts and practitioners to be the best method to take account of progress and form the basis of delay claims.

A methodology for assessing construction project delays

A Handbook for Construction Planning and Scheduling presents the key issues of planning and programming in scheduling in a clear, concise and practical way. The book divides into four main sections: Planning and Scheduling within the Construction Context; Planning and Scheduling Techniques and Practices; Planning and Scheduling Methods; Delay and Forensic Analysis. The authors include both basic concepts and updates on current topics demanding close attention from the construction industry, including planning for sustainability, waste, health and safety and Building Information Modelling (BIM).

Handbook for Construction Planning and Scheduling

Earned Value Analysis

Planning and Scheduling Practices

A Handbook for Construction Planning and Scheduling: Baldwin/A Handbook for Construction Planning and Scheduling

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