As used by the Federal Reserve Banks of Philadelphia and Cleveland in the “Occupational Mobility Explorer tool,” pairs of occupations can be classified as having a high, medium, or low-skill similarity based on the similarity score of the 25 most requested skills in online job postings for each occupation. Occupations without at least 25 skills are dropped from the tool. The high category includes pairs with a similarity score of at least 0.75; the medium category includes pairs with a score of at least 0.50 but less than 0.75; and the low category includes pairs with a score below 0.50.