Project supervisors make sure all aspects of a project are completed smoothly. In order to make sure projects are done correctly, project supervisors must have a strong knowledge of each task. As this is a general position, project supervisors are employed by a number of industries, the largest being the construction, engineering, manufacturing, marketing, and design industries. The work environment for project supervisors depends on their industry; those who work in construction, engineering, or manufacturing tend to work on-site, although they may have a trailer with an office. Project supervisors who work in marketing, design, or similar office-based industries work in a standard office environment.