The object that would be most useful for communicating over a distance would be the whistle. The other objects make noise, but they are quiet and may not be heard depending on how far the teacher separates the students. Reina could make different sounds with the whistle to communicate, so it could be an excellent place to start her device.

This statement is true. The best way to start the design process would be to ask questions about what you need to make, observe other devices already created or designed, and to gather information about needs and how things work.

A handbell would be the best device to choose if you were trying to communicate with other people using sound. A whisper does make a sound, but it will not travel far because it is so soft and quiet. A sign is a great way to share your location, but it does not use sound. A handbell is loud and could easily be heard.

The most important aspect listed for a device trying to communicate sound across a distance would be how loud it is. If the sound is too soft or quiet, no one will hear the message being sent. The "prettiness" of the sound and how heavy it is are not the most important characteristics.

Jeanette should use the traffic light as a model for her design. It is a successful device that uses lights to keep people safe and could be a good way for her to come up with ideas for her design.

The best object to start with if designing a device that uses light for communication would be the flashlight. The flashlight can be seen long distances, turned on and off, and can be flashed to send messages. A radio is excellent for communicating with sound but not light, and a mirror reflects light, but it doesn't make it's own light if you needed to communicate at night.

The best design plant would be "A bright sign that lights up from the inside and says "Yummy Tacos" in big, bold letters" because it would meet the design requirements. It would attract customers, be easy to see, uses light, and can be seen from a distance. Stores and restaurants use light to attract customers with their street signs, open signs, and colorful decorative lights.

The lights on the runway are intended to communicate where the safe place is for the plane to land. If it were to be improved, there could be more lights, brighter lights, and they could be added to both sides. Planes landing at night rely on these lights to get passengers to the ground safely. Part of the design process is making improvements on existing devices.

Both crosswalk screens and elevator buttons use light to send us a message. We can tell if the elevator is going up or down based on the lights, if the button for our floor has been pressed, or if the elevator is stuck based on the lights. A crosswalk will show us a hand or a walking figure when we need to stop or if it is safe to cross. It will also count down, so we know how long we have.

Waving a flashlight at night is a similar device to the lighthouse shining out to sea at night. Planes land in the dark and need to see the runway edges so they can line the plane up. Workers who wave the flashlights help keep the passengers and crew safe by letting the plane know where to land.