# Multi-Criteria Decision Analysis (MCDA)

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2.6 Multi-Criteria Decision Analysis (MCDA) Multi criteria analysis is a set of mathematical tools and methods, like weighting to compare different substitutes according to the criteria. Multi-criteria decision analysis (MCDA) helps to rank potential dumping sites using different criteria -such as soil suitability, habitat effect, flood resistance, property costs, distance from population center, and others by measuring the relative importance weight for individual evaluation criteria (Zeinhom El et al,.2010). The MCDA methods were developed in the 1960s to address problems and assist decision makers in decision-making with various options. Multicriteria approaches have the potential to reduce the cost and time involved in sitting landfills…show more content…
AHP has been integrated with GIS for land suitability modeling when selecting the best alternatives from a pool of various possibilities in the presence of multiple criteria. This technique provides a means of decomposing the problem into a hierarchy of sub-problems that can be more easily comprehended and subjectively evaluated. The subjective evaluations are converted into numerical values that are ranked on a numerical scale (Debishree et al., 2014). Combination of GIS and multi criteria evaluation (MCE) has been routinely adopted as an approach to assess the suitability of an area to host a landfill. Taking into account both technical elements and people’s values and perceptions is essential to build consensus around a decision, to reduce conflicts, and consequently to pave the way to successful landfill sitting interventions. Spatial MCE is commonly applied to land suitability analysis and specifically to landfill site selection (Tayyebia et al., 2010). 2.7 The Site Selection…show more content…
Site investigations should be designed to confirm published data, and collect data required measuring how well each site meets the criteria. To fully understand how each site may affect water resources, subsurface exploration and topographic surveys are carried out at the candidate sites. Designs are then completed to the point where approximate cost estimates can be made for comparative purposes. Step 5: Site Comparisons and Selection This step involves a detailed evaluation and comparison of the candidate sites. This requires comparing data collected from site investigations and published sources, and conceptual designs to determine which site best meets the criteria. Often, this is achieved by weighting and rating criteria. The weight of each criterion is determined according to its relative importance and each site is rated for each criterion. The method used for rating does not necessarily need to be the same for all criteria. Numerical ranking such as a scale of 1 to 9, or a qualitative ranking such as high, medium or low can be used. 2.9 Criteria used for solid waste disposal site