Many uncertainties can cause construction projects to be delayed, resulting in conflicts between the two parties to a construction contract. Using case study and content analysis methodologies, this study analyzed 79 litigation cases in Taiwan to identify the main causes of schedule delays in construction projects, which are “change orders,” “changed scope of the work,” “delayed site handover,” and “weather.” In this study, these causes are organized into a causation model to provide a reference for preventing schedule delay. The employed approach can be implemented for assessments of other regions, as schedule delays are common features in most construction projects.

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Schedule delays commonly appear in construction projects and result in delay claim progressively. Several studies have proposed various schedule delay analysis methodologies, however, most of the studies focused on the analysis of surface data (as-planned and as-built schedules), few of them on evaluating the effects of root causes, such as lost productivity. Loss of productivity is usually experienced by a contractor while accomplishing its works less than planned rate of production. Based on the literature review on lost productivity, this study further evaluated delay analysis methodologies, professional project management software and commercial delay analysis software to identify the capabilities of those methodologies and systems in dealing with the problem of lost productivity. Research results show that evaluated delay analysis methodologies, professional project management software and commercial delay analysis software cannot deal with the problem of lost productivity appropriately. That is, developing a comprehensive delay analysis method considering lost productivity is required.

Schedule delays commonly appear in construction projects and result in delay claim progressively. Several studies have proposed various schedule delay analysis methodologies; however, most of the studies focus on the analysis of surface data (as-planned and as-built schedules), few of them on evaluating the effects of root causes, such as the problem of lost productivity. Lost productivity, one essential delay cause, is usually experienced by a contractor while accomplishing its works less than planned rate of production. For analyzing the situations of schedule impacts caused by lost productivity, this study discusses a case of delay analysis with lost productivity in Taiwan. Through the study case, this study has proposed an approach to calculate schedule impact from lost productivity. The study results will be a basis for developing a comprehensive delay analysis method considering lost productivity.

Schedule delays commonly appear in construction projects and result in delay claim progressively. Several studies have proposed various schedule delay analysis methodologies. By using the as-planned and as-built schedules, most previous studies focus on the impact calculation of identified delay events on project duration. They consider the schedule variances between the as-planned and as-built schedules, but ignore to connect delay evidence to as-built schedule. Lost productivity, one essential delay cause, is usually experienced by a contractor while accomplishing its works less than planned rate of production. In a construction project, a contractor usually suffers certain damages by lost productivity caused by the owner or the third party, but the schedule impacts from the damages are not easily evaluated. How to calculate the schedule impacts by lost productivity plays a key role for solving a delay claim with lost productivity. This study tries to propose a delay analysis method for considering the schedule impact of lost productivity. With a simplified case study, the proposed method can be used as a tool to calculate the schedule impacts of schedule delays with lost productivity.