DoAssignment study guide

C1.3 · Select peripherals for a user task

Learn to select peripherals for a user task through clear examples and targeted practice.

Ontario Grade 11 Computer Science

Computer Environments and Systems

ICS3U C1.3 — Match a person’s needs to suitable input and output devices

A computer does not work alone. People use peripherals to provide information to a computer or receive information from it. A keyboard, scanner, headphones, and printer are all examples of peripherals, but they do different jobs. In this lesson, you will practise choosing peripherals for a particular user task. The key question is not “Which device is best?” but “Which device fits this user and task?” C1.3 is about making that selection. It does not require programming: the work is to understand the task, identify useful device features, and check that a proposed device can be used with the computer.

What you will learn

Explain what a peripheral is and distinguish input devices from output devices.
Identify the task requirements that affect peripheral selection.
Choose a suitable peripheral by comparing its function, accessibility, compatibility, and practical use with the user’s needs.
Justify a choice using information that can be checked in device documentation.

1. Start with the user and the task

A peripheral is a device connected to or used with a computer to help provide input or present output. Input travels from the user or the surrounding world into the computer. Output travels from the computer to the user or another destination. A touchscreen can do both: it displays information and receives touch input.

Before naming a device, describe what the user needs to do. Be specific. “Use a computer” is too broad; “record spoken ideas while walking through a quiet room” gives useful clues. Consider what information the user must enter or receive, where and how the work will happen, and whether the user has a particular access need. These requirements guide the choice.

Then identify the device’s job. A microphone captures sound as input; speakers or headphones present sound as output. A scanner captures paper information as input; a printer produces paper output. A device can be unsuitable even if it is familiar: a printer cannot capture a paper document, and a microphone cannot present a written page.

Begin with the user’s task, not a favourite device.
Input enters the computer; output is presented from the computer.
Some peripherals, such as touchscreens, support both input and output.

2. Compare requirements and check the device

Make a short list of requirements, then compare possible devices against it. Relevant questions include: Does the device perform the needed input or output job? Can this user operate it comfortably? Is it appropriate for the place and conditions where it will be used? Can it connect to the available computer, and does the computer support it? Is the device practical for the task, including its size, portability, and any needed supplies?

Compatibility is part of selection, not an assumption. A device may use a connection the computer does not have, or it may need software or support that is not available. Check the device’s manual or manufacturer’s specifications and compare them with the computer’s available connections and supported features. If the information is unclear, do not present a guess as a fact; ask for help or choose a clearly supported option.

A suitable choice balances the requirements. For instance, a large monitor may make text easier to see, but it is not a good portable choice if the user must carry the whole setup between locations. An inexpensive device may be unsuitable if it cannot perform the required task. Explain why the chosen features matter to this user.

Compare function, usability, setting, portability, and compatibility.
Use manuals and manufacturer specifications to verify device requirements.
A good choice meets the task’s important needs; it need not be the most expensive or feature-rich.

3. Make and explain a defensible selection

A clear selection can be explained in three parts: state the user task, name the peripheral, and connect its relevant features to the task. Add a compatibility check when the connection or computer support matters. This gives another person enough information to understand and verify your reasoning.

For example, “For a student who needs to hear spoken instructions without disturbing nearby classmates, choose headphones. They provide audio output directly to the listener. Check that their connector or wireless connection is supported by the computer.” The explanation is stronger than simply saying “Headphones are good,” because it links the device to the user’s need and identifies a fact to verify.

When needs compete, identify which one is most important. A user who needs to type for a long time may value comfortable key spacing; a user who enters occasional short notes may give more weight to portability. Do not assume that one feature suits everyone. Ask the user when the requirements are not known.

Connect the device’s function and features to a stated user need.
Check uncertain compatibility details rather than assuming.
Ask the user when an important requirement is missing.

4. A practical selection routine

Use this routine for a new task: describe what the user must enter or receive; note conditions and access needs; identify the kind of peripheral that can do the job; compare realistic options; verify computer compatibility using documentation; and explain the final choice. This is a way to organize judgement, not a guarantee that one device is right for every person.

There is no programming input, variable trace, or code output in these examples because the expectation is about choosing hardware for a user task. A written comparison is the appropriate way to show the reasoning. Classroom programming languages may differ, but no code is needed to make these selections.

Task → requirements → candidate device → compatibility check → reasoned choice.
The selection should be revisited if the user’s task or computer changes.

Task-to-device comparison

User task	Peripheral that may fit	Reason to consider it	Check before choosing
Capture a paper page	Scanner	Provides image input from paper	Connection and computer support
Record speech	Microphone	Captures audio input	Connection and any required recording support
Listen privately	Headphones	Presents audio to the listener	Connection and computer support
Enter text by speaking	Microphone with supported speech-to-text	May support spoken text input	User comfort and feature availability

Worked example

Capture a printed page

A school club needs to bring a signed paper permission form into a computer so it can be stored as a digital image. Choose a suitable peripheral and explain what to check.

Identify the needed direction
The paper image must enter the computer, so the task needs an input device that can capture a page.
Choose a device
A scanner is designed to capture paper documents as digital input, so it fits the main task better than a printer or speakers.
Verify the setup
Check the scanner manual and the computer’s available connections and supported features. The task does not specify a particular model, so a precise connection type should not be assumed.

Answer: Choose a scanner, then verify that the selected scanner can connect to and be used with the club’s computer.

Check: A printer produces paper output; it does not meet the stated need to capture a paper page as computer input.

Worked example

Work with spoken ideas

A student wants to record spoken ideas at a desk and listen back privately. Which peripherals fit the task? State what to verify before use.

Separate input and output
Recording speech sends sound into the computer, while listening sends sound from the computer to the student.
Match devices to each job
A microphone provides audio input. Headphones provide audio output privately, which matches the listening preference.
Check the connection
Confirm in the device documentation that the microphone and headphones can connect to the computer and that their required features are supported. If one device combines both functions, check that it provides both the required input and output.

Answer: Use a microphone for recording and headphones for private playback, or a suitable combined headset. Verify connection and computer support.

Check: Speakers could play the recording, but they do not match the stated preference for private listening as well as headphones do.

Worked example

Choose a way to enter text

A user with limited hand movement needs to enter short messages at a computer. The user says that speaking is comfortable and prefers not to type. Select a possible peripheral and describe how to confirm it is appropriate.

Use the user’s stated preference
The task is text input, but the user prefers speaking to typing. That preference is an important selection requirement.
Consider voice input
A microphone can capture the user’s speech. If the computer has suitable speech-to-text support, this may let the user enter messages without typing each word.
Confirm usability and support
Ask the user to try the setup and check the computer and software documentation for speech-to-text support. A microphone alone captures sound; it does not by itself guarantee that spoken words will become text.

Answer: Consider a microphone with supported speech-to-text capability, after confirming the user can use the setup comfortably and the computer supports the needed feature.

Check: Selecting only a microphone without checking for speech-to-text support would not establish that the user can enter written messages.

Common mistakes and how to avoid them

Choosing a device before describing what the user needs to do.

Correction: State the task and whether it requires input, output, or both before comparing devices.

Assuming every peripheral will work with every computer.

Correction: Check the device manual or manufacturer specifications against the computer’s connections and supported features.

Assuming that a microphone automatically turns speech into written text.

Correction: A microphone captures sound. Confirm that the computer also supports the speech-to-text feature needed for text entry.

Choosing a device based only on price or the number of features.

Correction: Give priority to the features that meet the user’s stated task, access needs, and use conditions.

Lesson summary

A peripheral helps a user provide input to a computer or receive output from it.
Begin selection by describing the task and the user’s requirements.
Compare device function, usability, setting, portability, and compatibility.
Verify uncertain details with device documentation and explain how the choice meets the need.

Check your understanding

Question 1

A user must put a paper drawing into a computer as a digital image. Which is the best first device to consider?

Scanner
Printer
Speakers
Headphones

Show answer and explanation

Scanner

A scanner captures information from paper as input. The other choices provide output.

Question 2

A student wants to listen to computer audio without playing it aloud. Which requirement most directly supports choosing headphones rather than speakers?

The student wants private listening.
The student needs to capture a paper page.
The student needs to enter text by speaking.
The student wants to print a document.

Show answer and explanation

The student wants private listening.

Headphones present audio directly to the listener and fit the stated preference for private listening.

Question 3

What should you do if you do not know whether a peripheral will connect to a particular computer?

Check the device documentation and the computer’s available connections and support.
Assume that all peripherals use the same connection.
Choose the device with the most features without checking.
Treat the device name as proof that it will work.

Show answer and explanation

Check the device documentation and the computer’s available connections and support.

Compatibility should be verified using information about both the peripheral and the computer.

Key terms

Peripheral: A device used with a computer to help provide input or present output.
Input device: A peripheral that sends information into a computer, such as a scanner or microphone.
Output device: A peripheral that presents information from a computer, such as a printer or headphones.
Compatibility: Whether a device can connect to and be supported by a particular computer setup.

Continue through ICS3U

View the complete ICS3U Ontario Grade 11 Computer Science curriculum and lessons

About this lesson and its review

Published by DoAssignment. This reviewed lesson follows Ontario Grade 11 Computer Science (ICS3U), expectation C1.3. It is a study resource, not an official curriculum publication.

Before publication, content is checked for structure, mathematical or chemical notation, calculations, course boundaries, and readability. Errors can still occur, so corrections are welcomed.

Official curriculum reference

Report a correction or ask a question