Similarly, Tier 3 secondary intervention is highly individualized. One of the challenges of providing intensive Tier 3 courses at the secondary level is how to do so in a way that will count for credits at the high school level. In addition, secondary students who need Tier 3 intervention are generally very far behind in academic skills and require longer classes. For this reason, secondary Tier 3 classes should be at least 90 minutes each. If such classes are designed to cover both remedial skills and credit-bearing standards content, they must be much longer (e.g., at least 120-150 minutes). In schools where the master schedule includes shorter time blocks for classes (e.g., 45-50 minutes), the best practice is to schedule back-to-back double or triple blocks so that enough time is allocated for the instruction. Some secondary students might take very few or no electives in order to catch up and meet standards in core academic areas. Intensive scheduling must be balanced with each student’s interests and needs for preferred courses.