The Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) is a multi-criteria decision analysis method that based on the concept that the chosen alternative should have the shortest geometric distance from the positive ideal solution (PIS), and the longest geometric distance from the negative ideal solution (NIS).
The Analytic Hierarchy Process (AHP) is a structured technique for organizing and analyzing complex decisions: 
- Choice 
- Ranking 
- Prioritization 
- Quality management