This document identifies employing unit responsibilities during an employee's probationary period and explains associated administrative procedures. Did you hire a new employee?Learn all about probationary period, what you should keep in mind, and how to do it right at Homebase! A new hire probationary period is a predetermined timeframe that starts on the employee's date of hire and concludes at the end of the period. Eliminate the Probationary Period​​ Avoid implying that an individual has any more employment security once the probationary period is completed. Simply state the facts. As previously noted, a person can get fired during a probation period, if they are in an atwill employment state. A Probationary Period Could Imply a Contract. The instructions are keyed to the letters on the application form. All applicants must fill out an application and register with the Administrative Office of Illinois Courts (AOIC).