1. Technological Systems Unit 1 ~ How They Work Lesson 3 ~ Systems Thinking
Explanation

2. Technological systems include input, process, output, and at times, feedback.
An open-loop system has no feedback path and requires human intervention, while a closed-loop system uses feedback.
Systems thinking involves considering how every part relates to others.

3. A system can include processes as well as things.
Technological systems can be connected to one another.
The output from one part of a system (which can include material, energy, or information) can become the input to other parts. Such feedback can serve to control what goes on in the system as a whole.

4. Almost all control systems have inputs, outputs, and feedback
Almost all control systems have inputs, outputs, and feedback. The essence of control is comparing information about what is happening to what people want to happen and then making appropriate adjustments. This procedure requires sensing information, processing it, and making changes. In almost all modern machines, microprocessors serve as centers of performance control.

5. 2. Concept mapping can be used to graphically display information and relationships among components of a system.
Video Cassette Recorder
Inputs
Processes
Outputs
Power cord
Power
AV signal
Blank cassette
Consists of
Records to tape
FF/RW
Playback
Programmable controls
Display of time and channel
AV from recorded tape
Display of tape progress
Standard AC Plug
Plastic shell
Spring-loaded Door
Mylar tape
Subsystems

6. Classified Intelligence on Kids’ Behavior
Saint Nicholas
Dutch
Beard
White Horse
Saint
Spain
Birthday
Bad Kids
Good Kids
Presents
Classified Intelligence on Kids’ Behavior
Book
Poles
North Pole
Santa Claus
has
celebrated by
is not the same as
rides
lives in is
gives to of
contains
lives at
don’t live at

7. Cell Phone Communication
INPUT
Network
PROCESS
OUTPUT
Voice Message
Physical Phone
Towers
Transmit Signal to Tower
Text Message
Transmit Signal to Phone
Internet Data
Transmitter
Signal to Wireless Access Point
Power System
Wireless Access Point
Receiver
1. Battery
2. Charger