They have restrictions, but no one method is better than the others for collecting information. They each have different means and objectives of study, positivist, being neutral scientific data, interpretative, being the meanings that humanity attaches to their actions, and critical sociological, being more political, with the desire to make the world best. A more politically engaged sociologist may prefer critical sociology, while a sociologist who is not political or wants to focus more on scientific data may prefer positivism. All three methods are unique in how the sociologist collects and applies the information they discover, but each approach is useful, depending on each person's goal as a student.