Final answer:
Four items that clarify a program concerning time are schedules, elapsed time on a 24-hour clock, operations with time, and knowledge of local and universal time systems.
Step-by-step explanation:
When it comes to clarifying a program concerning time, we can consider four important items: schedules, elapsed time with a 24-hour clock, applications of the four operations with time, anda proper understandingof time systems such as local and universal time. Schedules can include various aspects such as the pay schedule, breaks, vacation time, and the process for notifying supervisors of tardiness or sickness. Understanding elapsed time is crucial for determining the beginning, ending, and duration of an event. Mastery of the four operations (addition, subtraction, multiplication, and division) with time helps in planning and managing time effectively. Also, being familiar with concepts like local time, universal time, and time zones ensures accurate timekeeping in different parts of the world.