The credit hour or semester hour, terms used interchangeably, is the unit of instruction. One credit hour is constituted by a minimum of one hour of classroom or direct instruction and a minimum of two hours of out of class student work each week for a semester (or its equivalent). An equivalent amount of work (minimum three hours per week for a semester or its equivalent of combined direct instruction and outside of class student work) must be represented for a credit hour in other academic activities such as laboratory work, internships, practica, studio work and other academic work. Semester is defined as not less than 15 weeks. Courses offered in shorter timeframes must have an equivalent number of hours dedicated to instruction and student work as that spent in a semester-based class.