No, you do not have to take them in the same order unless they have pre-or co-requisites. If a course does not have a prerequisite, you may take it at any time it is offered. The order in the Catalog is only a suggestion for your success. Any prerequisite or co-requisite requirements are noted in the course description of the Catalog. Some courses in certain programs may only be offered during certain semesters (i.e., only in the Fall).