Input, direct data entry and output devices
Select input, direct-entry and output devices by matching how they work to the data, environment and users in a scenario.
Exam scope and assessment notes
Cambridge IGCSE Information and Communication Technology 0417, for exams in 2026, 2027 and 2028. Examples, datasets and practice are original StudyForA material; they are not Cambridge questions, source files, mark schemes or grades. Practical lessons teach transferable operations, but learners must perform them in locally available office and web-authoring software and inspect their own files. This site does not reproduce a Cambridge practical examination or award an official grade. The separate 2029 syllabus is not mapped here.
Before you begin
- No previous ICT course is assumed. Read each scenario carefully and justify a tool or method by connecting it to the task, user and constraints.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which device is designed to read shaded answer boxes on a form?
What you will learn
- Compare the characteristics, uses, advantages and disadvantages of common input devices.
- Explain direct-entry devices including magnetic stripe, chip and PIN, RFID, OMR, OCR, barcode and QR readers.
- Select output devices such as monitors, touch screens, projectors, printers, plotters, speakers, actuators and 3D printers for a task.
Input depends on the data and setting
Keyboards and numeric keypads suit deliberate text or number entry; pointing devices and touch screens select items; scanners digitise printed material; cameras capture images; microphones capture sound; sensors measure conditions; joysticks and wheels support directional control. A choice should reflect accuracy, speed, user skill and environment.
Direct data entry reads data from a source with less manual typing. OMR detects marks in fixed positions; OCR converts printed characters into editable text; barcodes and QR codes encode identifiers or links; RFID reads radio tags; magnetic stripes and chip-and-PIN devices support card transactions. These systems can be fast but still need checks for unreadable, damaged, duplicated or fraudulent inputs.
Output turns processing into a useful result
A monitor, projector, printer, speaker or actuator outputs information or action. Laser printers are useful for fast, high-volume text; inkjet printers can produce colour images; dot-matrix printers can make multipart forms; plotters suit large technical drawings. A 3D printer builds a physical object layer by layer.
A touch screen can be both input and output: it displays choices and detects a touch. An actuator converts a control signal into physical movement. Compare output quality, speed, cost, size and operating conditions rather than naming a device without explaining fit.
Sources for this lesson
Pause and explain
A warehouse must track tagged crates through a doorway without pointing a scanner at each one. Which method fits?
Worked example
A concert scans tickets at the entrance and sends a clear count to a control-room screen. Choose the input and output devices and explain a possible failure.
Show the worked solution
- A barcode or QR reader can capture the ticket identifier quickly.
- The ticket system checks the identifier against valid entries and updates the attendance count.
- A monitor displays the count; staff need a fallback for unreadable or already-used tickets.
Answer A barcode or QR reader is suitable because it reads the printed ticket code quickly and consistently. The system should reject duplicate codes and provide a manual check when a screen is damaged or a code cannot be read; a control-room monitor displays the updated count.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Choose between OCR, OMR and a barcode reader for (a) turning a typed page into editable text, (b) counting marked multiple-choice sheets and (c) identifying a packaged product.
Give me a hint
Match each source format with what the reader detects.
Compare my reasoning
- Editable text requires character recognition.
- Fixed answer-box marks require mark recognition.
- A product identifier printed as bars is read as a barcode.
(a) OCR; (b) OMR; (c) barcode reader. OCR may need proofreading, OMR requires marks in the expected positions, and a barcode identifies an item but does not itself describe all its properties.
Look for these in your work
- Matches each device to its input
- Mentions a limitation of automated reading
A clinic needs to enter a patient's temperature continuously and warn a nurse if it is above a safe threshold. Describe the input and output path.
Give me a hint
Follow the measurement from sensor through processing to a human-readable alert.
Compare my reasoning
- A sensor measures temperature and sends input data.
- The computer compares the digital reading with a specified threshold.
- A monitor or audible alarm presents the result; the alert must be checked by a nurse.
A temperature sensor supplies measurements; an analogue signal is converted to digital data if necessary, then software compares it with the threshold. A monitor can display the value and an alarm can warn the nurse. The alert supports, but does not replace, clinical judgement.
Look for these in your work
- Describes input, processing and output
- Links the device choice to its use
A library is considering chip-and-PIN, RFID cards or staff keyboard entry for borrowing. Compare them for queue speed and misuse risk.
Give me a hint
Consider how each method captures identity and what checks are still required.
Compare my reasoning
- Compare manual entry with automated card reading.
- Explain one speed or accuracy benefit and one misuse risk for each automated option.
- Recommend controls such as authentication, duplicate checks or staff review.
Keyboard entry is flexible but slower and vulnerable to typing errors. Chip-and-PIN can authenticate a cardholder but adds a step and a PIN can be observed; RFID can speed up scanning but a lost or unauthorised tag may be misused. Link each borrower to an authenticated account and log returns, with staff review for exceptions.
Look for these in your work
- Compares rather than merely lists
- Includes a safeguard for the selected system
Common mistakes
- Confusing OCR, OMR and barcode scanning
- Treating speed as proof that direct entry is always accurate
- Naming a printer without relating it to volume, colour or material
What can you explain now?
Which device converts scanned printed words into editable characters?
Compare with the explanation
OCR reader
OCR recognises character shapes and converts them into text data.
After trying it yourself, choose your next review. This is your self-assessment.
Your review choice appears on Today. Sign in to sync it across devices.
Make it stick
Explain how OCR, OMR and a barcode reader differ, then give one output device for a physical action.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.