Multiobjective evaluation of construction methods alternatives (1989)
AuthorsKiarie, Ndekei Johnshow all
Multiobjective evaluation methods are used to analyse alternative construction methods in order to select the construction method which is most appropriate given available resources to achieve or partially achieve technical, economic and social objectives. A hypothetical project using four alternative methods of construction is evaluated with respect to nine objectives to test whether weighting methods, attribute rating methods and final evaluation procedures are practical for application to choice of construction methods. The direct weight assessment methods tested are those using ranking and rating weighting. The attribute rating methods tested are use of maximum and minimum values of an objective, anchoring of one extreme objective value and anchoring of two extreme objective values. The final evaluation procedures tested are; weighted summation, weighted summation with elimination and weighted summation with pre-evaluation weights and performance weights. The results of this work indicate that the use of the multiobjective evaluation procedure with the following steps is practical. The objectives set must have clear definitions and measurement scales. Relative value weights are derived using the ranking procedure. Comparison of the alternative construction the methods to estimate their achievement objectives. Maximum and minimum values methods is made by analysing with respect to the decision of an objective are used to transform the objectives' achievement scores into attribute ratings. Weighted summation with pre-evaluation weights and objectives' performance weights is used to select the best method. The evaluation method is appropriate for general application over a range of project conditions to select the construction method that achieves or partially achieves the technical, social and economic goals.