When it comes to providing a rationale for something, there are several synonym phrases that you can use in order to convey the same meaning. For instance, some alternatives to 'provide rationale for' include justifying, explaining the reasoning behind, providing a basis for, giving a logical explanation, accounting for, and presenting a case for. Regardless of the synonym you choose, the goal of providing a rationale is to provide a sound and coherent argument that backs up your claims or beliefs. This is particularly important in academic, professional, and scientific settings where clear and concise reasoning is crucial to understanding, agreement, and decision making.