This is a document I have used for 10 years that correlates to a measurement program in use by the University of Georgia's School of Work Ethic. The Likert scale can be entered online and a numerical score is derived in three important components of work ethic; Reliability, Initiative and Teamwork. I have used this as an IEP measuring device.
I have added a scale to be used by employers or supervisors to compare my student to full time employees. Naturally, if their score is near 100%, I can ask why they are not being offered a job.