Following the initial assessment (which should be taken under the instructor's supervision), the ALEKS system will automatically schedule any other assessments needed for correctly informing and guiding a student's progress. The instructor, however, can order an individual or group assessment at any time. It is a good practice for the instructor to schedule supervised assessments at regular intervals (midterm and end of the course), as "snapshots" of overall course achievement. Assessments may be ordered more frequently if the instructor feels that there has been third-party help on some automatic assessments, producing invalid results.