Factors Affecting Schedule Delay, Cost Overrun, and Quality Level in Public Construction Projects

Abstract

Due to the loss of financial resources and the need to optimize projects, academics, politicians and the construction industry have become increasingly aware of the challenges presented by the frequent time and cost overruns and reduced quality level of construction projects. The purpose of this study is to analyse the factors that project managers experience as having the greatest effect on time, cost and quality, and to discover whether the factors' effects are significantly different from each other. A questionnaire with 26 factors identified from interviews was sent to the full population of publicly employed project managers. Factors were ranked by using the relative importance index and tested for significant differences by applying the Friedman´s test with the Wilcoxon´s test as post-hoc analysis. From the analysis, the most affecting factor associated with time was found to be unsettled or lack of project funding. For the cost related factor, errors or omissions in the consultant material, was the most important. Finally, the quality related factor was errors or omissions in construction work. The main conclusion of this research showed that the project schedule, budget and quality level are significantly different affected. The project manager therefore cannot handle such critical issues by only focusing at schedule or budget related complication, either can the project manager assume that time, cost and quality are equally affected.

Analysing significance of key quality factors for management of construction projects

“…The fourth part analysed the quality factors, and the success factors were analysed in the fifth part. The ranking was conducted according to importance (Relative Importance Index -RII) and the respondents were grouped into investors, contractors, and project managers [27,28]. Ranking RII is made according to the expression (1): (1) where: Σw -sum of grades given to each factor A -max.…”

Identificación de factores que generan diferencias de tiempo y costos en proyectos de construcción en Colombia

“…Artículos Incumplimiento y problemas en [2], [7], [16], [15] [17] general con subcontratistas Calamidades climáticas [16], [18], [19] Condiciones gubernamentales [16] Cambios en el alcance del [5], [7], [9], [18], [20] contrato por parte del dueño Escasez de trabajadores [9], [18], [21] Mano de obra no calificada [1], [7], [9], [18], [19], [20] Mala planeación y programación [2], [3], [5], [6], [7], [9], [11], [12], [17], [20], [22] por parte del contratista Falta de comunicación entre las [5], [17] diferentes partes involucradas en los proyectos. Fluctuaciones de la moneda [1] Cambios en los diseños [11], [12], [18], [19], [23] Conflictos laborales y huelgas [17], [18] En India, por ejemplo, se encontró que en promedio, entre una muestra de 290 proyectos, existía una excedencia en costos del 73 % [5].…”

Rural Residents’ Perception of Construction Project Delays in Pakistan

“…A study by Mahamid et al [6] on a time performance of road construction projects in the West Bank in Palestine explored the views of contractor and consultant on causes of delays and revealed that contractor and consultant suffer from many problems which affect the project performance negatively. According to Larsen et al [40], construction project schedule, budget, and quality is affected in significantly different ways in Denmark construction industry and found the lack of project funding, omissions in consultant material, and omissions in construction work to be the most critical factors affecting project time, cost, and quality. Odeh and Battaineh [41] studied the main causes of construction delay and explored that the extensive delays are the cause of costly disputes and claims among contractor and consultant.…”