I’ll try to find links. Here’s one.
http://students.eng.ua.edu/advising/faq/#depthstudy
From the above link:
"The Depth Study Requirement can be found in DegreeWorks. In order to complete this requirement students must complete six credit hours in HI/SB or six credits in HU/L/FA within the same discipline/subject. Students cannot fulfill requirement with three credits of HU/L/FA and three credits HI/SB. For example, Economics- EC 110 and EC 111- taken as two HI/SB electives, or Spanish- SP 101 and SP 102- taken as two HU/L/FA electives.
Review the Core Curriculum and search by attributes (HI/SB/HU/L/FA) on the University Registrar’s website."
Not terribly detailed, unfortunately. I’ll keep looking for better info for you, and I’ll post anything I find that is more helpful. What is provided is very vague, which works OK when you come in with CLEP credits satisfying the requirement . . . but clearly you need more precise info when you are choosing classes! If you contact the registrar or otherwise get detailed info, please come back and post here for future parents/students.