My general understanding of the origins of the system:
100s=freshman
200s=sophomore
300s=junior
400s=senior
500s+=graduate
Of course, this is not a particularly accurate description of the actualy meaning of the numbers, but I think it's the motivation for them. At my school, 100s-200s are usually basic, lower-level classes, 300s are more specific topics, 400s are advanced topics, and 500s are graduate (600s+ are rare, at least in my college). Anything 300s+ tends to be primarily for majors, but specific 300- and 400-level classes are often not required for the major; rather, some number of them must be done as electives for the major.
100s=freshman
200s=sophomore
300s=junior
400s=senior
500s+=graduate
Of course, this is not a particularly accurate description of the actualy meaning of the numbers, but I think it's the motivation for them. At my school, 100s-200s are usually basic, lower-level classes, 300s are more specific topics, 400s are advanced topics, and 500s are graduate (600s+ are rare, at least in my college). Anything 300s+ tends to be primarily for majors, but specific 300- and 400-level classes are often not required for the major; rather, some number of them must be done as electives for the major.
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