Importance Performance Analysis of Factors Causing Reworks in the Construction Industry

Rework can bring negative effect to construction project. This research aims to identify
the importance level of factors causing reworks in structural, finishing, and mechanical, electrical
and plumbing (MEP) works by a way of importance performance analysis (IPA). In order to reach
this objective, the research evaluates the degree of occurrence the factors in each type of works and
analyzes the level of difficulty in preventing the occurrence of the factors. The results are based on
questionnaire survey, involving general and MEP contractors in Surabaya. Design related factors
are the most frequent and most difficult to prevent in structural and finishing works. In MEP
works, the most frequent factors are tight construction duration and unclear instructions from
owner and designer; whilst insufficient owner�s capital is the most difficult to prevent. The
research finds two factors that have high importance level, i.e. design changes and insufficient
detail drawings.