Within the US News Best Graduate Schools Rankings 12 broad areas are considered, and each of the broad area list includes a few specialties and programs. For each broad field there is a separate methodology. 

US NEWS BEST GRADUATE SCHOOLS RANKINGS INCLUDE THE FOLLOWING RANKINGS:

Best Business Schools 

Ranking: https://www.usnews.com/best-graduate-schools/top-business-schools/mba-rankings 

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/business-schools-methodology

Best Law Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-law-schools/law-rankings

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/law-schools-methodology

Best Medical Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-medical-schools/research-rankings; 

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/medical-schools-methodology

Best Engineering Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-engineering-schools/eng-rankings

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/engineering-schools-methodology

Best Nursing Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-nursing-schools/nur-rankings

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/nursing-schools-methodology

Best Education Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-education-schools/edu-rankings

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/education-schools-methodology

Best Fine Arts Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-fine-arts-schools/fine-arts-rankings

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/fine-arts-schools-methodology

Best Public Affairs Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-public-affairs-schools/public-affairs-rankings

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/public-affairs-schools-methodology

Best Library and Information Studies Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-library-information-science-programs/library-information-science-rankings

Methodology: https://www.usnews.com/education/best-graduate-schools/articles/library-and-information-studies-methodology

Best Health Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-health-schools

The methodology depends on the specialty. 

Best Science Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-science-schools

The methodology depends on the specialty. 

Best Social Sciences and Humanities Schools

Ranking: https://www.usnews.com/best-graduate-schools/top-humanities-schools

The methodology depends on the specialty.