ARTICLE 11 HOURS OF WORK SECTION 1 - STANDARD WORKWEEK The standard workweek is defined as five 8-hour days, normally Monday through Friday, unless local circumstances require a different workweek for some employees. Full-time employees are on duty regularly 8 hours per day. Part-time employees are on duty on prescribed days and hours. SECTION 2 - STANDARD TOUR OF DUTY The standard tour of duty is defined as the specific hours in the standard 8-hour workday. This will be negotiated at each Center. SECTION 3 - ALTERNATIVE WORK SCHEDULES Employees will use the standard workweek and tour of duty unless they are on an alternative work schedule (see AWS Article). SECTION 4 - CHANGES The Agency will notify the Union and employees at least two weeks in advance of any change in the hours of work, unless precluded by emergency situations. SECTION 5 - BREAKS Employees may take two 15-minute breaks during their tour of duty. SECTION 6 - SHIFT WORK If the standard workweek at a Center includes shift work, fully qualified employees may volunteer for reassignment to vacancies on another shift. If there are more volunteers than vacancies, the supervisor(s) will first select employees in the same work unit to fill the vacancies, according to their service computation date. Other procedures for shift work will be negotiated at each Center. SECTION 7 - START-UP TIME/CLEAN-UP TIME Consistent with the nature of the job, hours of work will allow a reasonable amount of time for all tasks related to the performance of the work, such as personal cleanliness, and clean-up and storage of Government property, tools, and equipment. This Article may be supplemented.