Key term
WJEC A-Level Computer Science 601-5345-3
Hardware: Architecture, Memory and Storage
Networks and Data Transmission
Logic Gates and Boolean Algebra
Data Representation and Data Types
Data Structures
Organisation of Data: Files and Records
Database Systems
The Operating System
Algorithms and Programs
Principles of Programming
Systems Analysis
Software Engineering and Program Construction
Topic overviewIntegrated development environments and their purposeEditors, syntax highlighting and code entry toolsDebugging tools: breakpoints, stepping and watchesTranslation, source code and object codeLexical analysis and the symbol tableSyntax and semantic analysisCode generation and optimisation
Types of Software System
Practical Programming
Data Security and Integrity
Computing, Society and the Law
Topic overviewSocial and economic change from computingComputers and the nature of employmentThe digital divide and cultural changeEnvironmental cost of computingData protection and freedom of information lawThe Computer Misuse Act 1990 and computer crimeCopyright, surveillance and professional codes
Advanced Data Structures and Logic
Recursion, Sorting and Searching
Programming Paradigms and Translators
Topic overviewFunctional, declarative and imperative paradigmsClasses, methods and object-oriented designStandardisation of computer languagesAmbiguity in natural language and unambiguous notationBackus-Naur form and syntax diagramsCompilers, interpreters and assemblersTranslation and execution errors
System Design and Human-Computer Interaction
Software Engineering Tools and Professional Practice
Topic overviewSoftware tools for the software engineering processSoftware packages in systems analysis and specificationSoftware packages in systems designTesting tools and testing strategiesProgram version managementProgram libraries and project management toolsCodes of conduct and professional behaviour
Advanced Architecture and Assembly Language
Communication Networks and File Organisation
Number Representation and Floating Point
Databases and Distributed Systems
Topic overviewConsistency, redundancy and data independenceRelational organisation and normalisationRestructuring data into third normal formEntity relationship modellingQuery languages and SQLValidation, verification and the DBMSBig Data, data warehousing and miningDistributed systems and distributed databases
Operating System Management
Software Systems and Applications
Data Security, Cryptography and Attack
System Design and Human-Computer Interaction
- 7 subtopics
- 21 things to know
- A2 Unit 3
What System Design and Human-Computer Interaction covers
System Design and Human-Computer Interaction is examined in A2 Unit 3, Programming and System Development. It covers the waterfall approach, agile approaches, documentation and when it is produced, contemporary approaches to communicating with computers, natural language interfaces and spoken ambiguity, design review and validation and evaluating a computer based solution.
The 7 subtopics
Each one has its own page.
- The waterfall approachWaterfall approach to development, stages of the waterfall model in order and signed-off requirements specification.Open →
- Agile approachesAgile approach to development, iteration or sprint and role of the customer in an agile project.Open →
- Documentation and when it is producedFour things technical documentation contains, four things user documentation contains and risk that thin documentation creates.Open →
- Contemporary approaches to communicating with computersHuman-computer interaction, four styles of user interface and gesture-based interface.Open →
- Natural language interfaces and spoken ambiguityLexical ambiguity, syntactic ambiguity and referential ambiguity.Open →
- Design review and validationDesign review and inappropriate technique that a review should catch.Open →
- Evaluating a computer based solutionEvaluation, in the systems life cycle, six criteria commonly used to evaluate a solution and effectiveness in an evaluation.Open →
What you need to know
Answer each one before you reveal it.
Your recallNot started
Process
Which documents are produced at each stage of development, and why is the test plan written at the design stage?
Key term
Give an example of lexical ambiguity.
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What is the waterfall approach to development?
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What is an agile approach to development?
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What is human-computer interaction?
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What is evaluation, in the systems life cycle?
Process
Name the stages of the waterfall model in order.
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What is an iteration or sprint?
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What documentation is produced during the feasibility study?
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Name four styles of user interface.
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What makes an interface a natural language interface rather than a voice-controlled command interface?
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What is a design review?
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Why must evaluation criteria be agreed before the system is built?
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Why is the waterfall model given that name?
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How does agile treat changing requirements?
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What documentation is produced during analysis?
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What is a gesture-based interface?
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Why is speech recognition only the first half of the problem?
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In a design review, why is correspondence with the specification checked first?
Key term
Rewrite "the system should be fast" as a measurable criterion.
Take System Design and Human-Computer Interaction further
The same content, four other ways.
Questions from this topic
Each one with the model answer underneath.
- 1
What is the waterfall approach to development?
Model answer
A method in which the work is divided into sequential stages, each completed and signed off before the next begins.
- 2
Name the stages of the waterfall model in order.
Model answer
Requirements analysis, design, implementation, testing, installation and maintenance.
- 3
Why is the model given that name?
Model answer
The output of each stage flows down into the next, and the work is not intended to flow back up.
- 4
What is a signed-off requirements specification?
Model answer
An agreed statement of what the system must do, accepted by the client before design begins.
- 5
Give three advantages of the waterfall approach.
Model answer
Progress is easy to measure against defined stages, the documentation produced is thorough, and the cost and timescale can be estimated early.
- 6
Give three disadvantages of the waterfall approach.
Model answer
The client sees nothing working until late, requirements are assumed to be fully known at the start, and a change discovered late is very expensive.
What is inside Levo
Six ways to work the same material.
System Design and Human-Computer Interaction revision questions
- What does System Design and Human-Computer Interaction cover in WJEC A-Level Computer Science?
- 7 subtopics: the waterfall approach, agile approaches, documentation and when it is produced, contemporary approaches to communicating with computers, natural language interfaces and spoken ambiguity, design review and validation and evaluating a computer based solution. Each one has its own page with questions and model answers.
- How is System Design and Human-Computer Interaction organised?
- By the WJEC 601-5345-3 specification, subtopic by subtopic, so it matches the order you are taught it in.
Every question in System Design and Human-Computer Interaction, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
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