Interval-valued fuzzy multiple criteria decision-making methods based on dual optimistic/pessimistic estimations in averaging operations

- Decision-making methods with optimistic/pessimistic averaging operations.
- Multiple criteria decision analysis within an interval-valued fuzzy environment.
- Algorithms involve changes in overall judgments and in the separate evaluations.
- The feasibility is illustrated by an application to medical decision making.
- A comparative study is implemented with computational experimental analysis.