© 2019 |Published by Scholars Middle East Publishers, Dubai, United Arab Emirates 84 Saudi Journal of Civil Engineering Abbreviated Key Title: Saudi J Civ Eng ISSN 2523-2657 (Print) |ISSN 2523-2231 (Online) Scholars Middle East Publishers, Dubai, United Arab Emirates Journal homepage: https://scholarsmepub.com/sjce/ Original Research Article Comparative Study of Prospective Delay Analysis Techniques (DATs) Suroj Ghimire 1 , Anjay Kumar Mishra 2* 1 NP Associates Pvt Ltd, Project controller, Nepal 2 Associate Professor, Madan Bhandari Memorial Academy, Urlabari, Nepal DOI: 10.36348/SJCE.2019.v03i05.001 | Received: 15.08.2019 | Accepted: 05.09.2019 | Published: 11.09.2019 *Corresponding author: Anjay Kumar Mishra Abstract Delays are the major sources of disputes and adverse relationships between the stakeholders in construction industry. The existing delay analysis techniques (DATs), though helpful for decision-making, have not succeeded in properly addressing the high incidence of disputes associated with delay claims resolutions. This research has made a comparative study of limitation and capabilities of different ‗Prospective‘ DATs i.e., Impacted as Planned method and Time Impact Analysis Method under the same baseline program and under similar circumstances of delay occurrence through the case study of under-Construction Hydroelectric Project and review of the relevant issues not addressed by the techniques. Oracle‘s Primavera (P6) software has been used for delay analysis. The Contractor has not followed any of the DATs to raise the claim for extension of time. Though the contractor has submitted its revised construction schedule as per the FIDIC conditions of contract and ask for time extension of 721 days, the revised construction schedule has no any linkage with the original approved baseline Schedule. The Impacted as planned technique confined the delay to 621 days. The actual site condition and the progress were not considered in this method. The concurrent delays and pacing delays were also not addressed. According to the Time Impact analysis technique, the contractor‘s caused delay was 101 days and the delay from Employer‘s side was 529 days. The actual site condition and the progress were considered in this method. However, none of the Delay analysis techniques is found to address all the delay occurring events. The concurrent delays and pacing delayswere also not addressed. Time impact analysis technique is more accurate method as the site progress is incorporated in this method and is recommended to be followed. Keywords: Impacted as Planned, Time Impact, Actual site Condition. Copyright @ 2019: This is an open-access article distributed under the terms of the Creative Commons Attribution license which permits unrestricted use, distribution, and reproduction in any medium for non-commercial use (NonCommercial, or CC-BY-NC) provided the original author and source are credited. INTRODUCTION BACKGROUND Construction delays are a main source of claims and disputes and have even been considered as the most common and costly cause of problems. Construction delays impart adverse impact on the success of the project in terms of time and cost. Its effect is confined not only to the construction industry alone, but also to the overall economy of a nation. To substantiate the delay in Mega project is very complexin itself. The different methods that are used to provedelays, as explained in industry standards and handbooks, are theoretical and could be applied inthe small simple projects with few numbers of activities but the same methods cannot easily beapplied on mega/complex projects [1]. Barry [2], in his paper, presented on the international conference by the Society of Construction Law, mentioned that Impacted as-planned method, Time impact analysis method, Collapsed as-built or ‗but-for‘ analysis method, Snapshot/windows/ time slice analysis method, As-planned versus as-built windows analysis methods are commonly used delay analysis techniques. Inspite of the availability of these techniques, the most appropriate way to analyze the delays and causes of delay is still arguable subject. Arditi and Pattanakitchamroon [3] claimed that that none of the identified delay analysis methodology can be universally used in all situations, although they noted that the Windows Analysis/Time Impact Analysis is the most acceptable method and provides the most reliable results. Researchers have identified multiple factors affecting the selection and the results of the delay analysis methodology. The assessment to raise the claim for extension of time is one of the serious issue. The Baseline Schedule is an important tool whereby delays are impacted in a systematic approach to find out the overall delay occurred in projects. Basically, the DATs