Fuzzy Evaluation of Stakeholders' Aspects in Water Resources Management

The contents of this work in short terms, is to include the stakeholders' opinion which is taken from the questionnaires. The work focuses on the weight's assessment of the criteria based on the stakeholders' opinion. This process is very useful in water resources management since in such a way a bottom-up management is created that eliminates conflicts and strengthens solutions viability. A sub-problem of this goal, is the importance (weight) of each participant. Firstly, a rather qualitative information is quantified by using fuzzy trapezoidal numbers. Two methods are examined to assess the weights of the stakeholders based on fuzzy similarities. This step is required in order to aggregate the stakeholder's opinion regarding the weights of the criteria. Consequently, a multicriteria method based on the scores of the alternative over all criteria can be further exploited. The smaller diversity of the weights of the participants is produced when the total similarity measure is used. The methods of similarity especially the method of total similarity would be preferable, assuming a two-stage workshop will be held.