Instead, it helps make selections based on qualitative properties such as performance.Īrroyo, Tommelein and Ballard (2014) offered a critique of AHP in a paper in the Journal of Construction Engineering and Management. In the US, engineers used an AHP rating system to prioritise maintenance projects for thousands of public structures, including nearly 3,000 bridges in need of repair.Īs a material selection tool, AHP is designed to look beyond a product’s price or life cycle while removing conflicting or biased evaluation criteria based on less quantifiable factors such as personal preference or previous experience. Rather than prescribing a "correct" decision, AHP helps decision makers find one that best suits their values and their understanding of the problem.įor this reason, AHP is sometimes used in engineering, construction management, portfolio management, facilities maintenance, material selection and other important situations. To assist in the calculation process, Saaty created a sample nine- point scale, which is reproduced in the study, Analytic Hierarchy Process-Based Construction Material Selection for Performance Improvement of Building Construction: The Case of a Concrete System Form.īecause AHP is designed to assist in the analysis of complex situations, it has been used in business, manufacturing and other industries. More advanced software is also available to automate the process. However, basic AHP calculations can be performed by readily available tools such as Excel. Criteria with higher numbers are seen as more important.ĭespite being technically valid and practically useful, AHP has been criticised for its reliance on mathematics. Linear algebra is a type of mathematics that can be used along with pairwise comparisons to prioritise the criteria, based on the weight of its importance. Utility is defined as a numerical representation of how useful or beneficial something is. Pairwise comparisons make it easier to select the most appropriate choice once the utility factor has been calculated. This is achieved through pairwise comparisons, a method of analysis that evaluates two criteria at the same time rather than comparing several criteria at once. What criteria will be used to judge the possible solutions?Īfter phase three has been determined, it is then possible to calculate an importance weighting for each criterion. What are all of the available alternatives? Along with AHP, Saaty created two other decision-making approaches - the Analytic Network Process or ANP (for decisions that depend on feedback) and Neural Network Process or NNP (which incorporates the mathematics of ANP and applies neural firing and synthesis).ĪHP takes a problem and examines it in three phases: AHP can help to identify the most beneficial solution using a systematic approach that ranks different options based on importance.ĪHP was developed in the 1970s by Thomas Saaty, a university professor who specialised in statistics and operations research. ![]() The analytic hierarchy process (AHP - or analytical hierarchy process) is a form of multi-criteria decision making (MCDM) that applies mathematics and psychology to the selection process - with minimal bias - when no clear choice is apparent. ![]() ![]() 6 Related articles on Designing Buildings Wiki.
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