ch 6 + 7

How can a computerized system manage student registration and attendance?

Records entries and exits, generates attendance reports, identifies absences.

What are the benefits of a computerized school system?

Accurate records, saves time, easy data retrieval.

Why do we need an ADC?

To convert analog signals into digital data for processing.

What are the advantages and disadvantages of an online booking system?

Advantages: Convenience, reduced errors. Disadvantages: Security risks, technical issues.

Describe how GPS systems work.

Receives signals from satellites, calculates location based on time delays.

What are the advantages and disadvantages of drones?

Advantages: Cost-effective, safer for humans. Disadvantages: Limited flight range, regulatory issues.

How are frequencies identified?

Using unique signal patterns or IDs.

What are the advantages and disadvantages of RFID?

Advantages: Quick scanning, large data storage. Disadvantages: Privacy concerns, high cost.

Describe the processing involved in a computer-controlled burglar alarm.

Sensors detect intrusion, microprocessor processes signals, triggers an alarm.

What are the four components of an expert system?

Knowledge base, inference engine, user interface, explanation facility.

Why is data verified?

To ensure that the data entered has been copied correctly.

Compare proof reading and verification.

Proof reading: Checking for errors. Verification: Comparing data with the original source.

Define double entry.

Entering data twice and comparing both sets.

What is validation?

Ensuring that data meets certain criteria when input.

List the stages of the System Life Cycle.

Analysis, Design, Development and Testing, Documentation, Implementation, Evaluation.

Name three methods of implementation.

Pilot, parallel, direct changeover.

What are the types of data?

Live data, archived data, test data.

What are two drawbacks of interviews?

Time-consuming, subject to bias.

Why is testing important?

Ensures the system functions correctly and meets requirements.

Explain why direct changeover is preferred over parallel running.

Quicker implementation, less costly.

What are two evaluation strategies?

Post-implementation review, benchmarking.

Describe the different testing strategies.

Unit testing, integration testing, system testing, acceptance testing.