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After reading the scenario, answer the questions that follow.

David works downtown at a construction site. During the day, the construction site can be very noisy due to machines and traffic. In the past, workers used paper to write out messages so that they didn't have to compete with the noise. The morning shift supervisor called out jobs for the day. One day, David thought he heard his boss assign him to a project in room $4.$ Since he wasn't sure and didn't want to make a mistake, David asked his supervisor, "Can you repeat the room number?" Later that day, he suggested to his boss that he create a schedule.

Three months later, the foreman started using a scheduling board to make the information more transmittable in a timely manner. Introducing the scheduling board has saved time and improved communication. Worker productivity has gone up$,$ and the company has saved money. One day, David was called into the foreman's office. David was afraid something was wrong, but much to his surprise, his boss just wanted to thank him for his suggestion to use a scheduling board.

When the supervisor called out assignments, David didn't hear the room number. With what part of the communication model was he having problems?

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