If it is a problem, there is generally a definite solution, and the problem solved is generally relatively simple. This popularity is limited, such as the calibration of oil storage tanks last year, which is unnecessary. The advantages and disadvantages of the model and the improvement direction can be evaluated emphatically. If Question B is generally open-ended, the established model is generally universal and can be popularized. For example, the impact assessment of last year's Shanghai World Expo is actually a quantitative assessment, and of course it can also be made into a forecast, no matter which one, it can be promoted. Quantitative evaluation, which is mostly a qualitative evaluation problem at present, is a better method (personal opinion) fuzzy comprehensive evaluation, with AHP and principal component analysis as weights, and principal component analysis is recommended, because sometimes. After this model is built, you can compare other activities horizontally, such as the Olympic Games and the World Cup, and vertically compare Shanghai in previous years. . You can also use the evaluation of other issues, such as the quantitative evaluation of energy conservation and emission reduction, and the ranking evaluation of some qualified institutions, such as law firms, which is the comprehensive ranking. . You can refer to the first prize of the national competition.