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Computer Science A-Level > System Design > Flashcards

System Design Flashcards

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1
Q

Abstraction

A

simplifying problems by removing unnecessary information or irrelevant detail

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2
Q

Activity Diagram

A

can appear quite similar to flow charts, but serve the purpose of both a flow chart and a data flow diagram in agile methodology. They show processes involved in a single use case from beginning to end

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3
Q

Adaptive Maintenance

A

changing the system to meet new needs, generally due to external factors, i.e., changing to update VAT or tax rates

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4
Q

Agile Development

A

a cyclical approach to software development involving continuous improvement, shorter development cycles, wider market windows and early customer feedback

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5
Q

Argument

A

when a parameter is given a specific value

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6
Q

Bespoke Software

A

software that is custom written and tailored for a specific task or customer, that is costly and time consuming to produce and works exactly as required

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7
Q

Class Diagram

A

says the name, attributes and methods of a class, often drawn as a hierarchy showing how features of the super class are inherited by the derived classes

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8
Q

Communication Diagram

A

these show the interaction between objects in a system

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9
Q

Compatibility Evaluation

A

looks at whether the system will work with existing system, specifically looking at whether any bus have been identified, is it reliable, and are access times to data acceptable

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10
Q

Computational Thinking

A

an idea developed by Jeanette Wing that means to think like a computer scientist

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11
Q

Control Abstraction

A

process by which programmers define new control constructs

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12
Q

Corrective Maintenance

A

fixing faults in the program, i.e. bug fixing

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13
Q

Data Abstraction

A

enforces a clear separation between the abstract properties of a data type and the concrete details of its implementation

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14
Q

Data Dictionary

A

a collection of data and attributes about data elements that are being used in a database, describing the meanings and purpose of data elements within the projects context and provides guidance on interpretation

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15
Q

Data Flow Diagrams

A

show entities, processes, data flows and data stores

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16
Q

Development Phase

A

involves production of programs, tailoring of software and modification of code. Traditionally, the system is fully specified, programmers work to the requirements specification and this is usually used on large systems developed by large teams

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17
Q

Direct Implementation

A

at a convenient time, the old system is stopped and the new one is started

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18
Q

Economic Feasibility

A

whether or not you can afford to solve a problem within the current budget

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19
Q

Entities

A

sources of data

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20
Q

ERD

A

Entity Relationship Diagram

shows how different entities relate to each other in an application or database

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21
Q

Environmental Feasibility

A

whether or not a system is environmentally acceptable

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22
Q

Ethical Feasibility

A

whether or not a system is socially and ethically acceptable to produce the system

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23
Q

Feasibility Study Report

A

describes whether the system is a feasible solution to the problem, looking at various types of feasibility

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24
Q

Functional Abstraction

A

where the implementation detail of the computational method is hidden

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25
Q

Gradual Changeover

A

one part or module of the system is changed over separately; the new part is then checked, before the next part of the system is changed, thus, it may take a long time to changeover the whole system

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26
Q

Implementation

A

involves replacing the old system with the new

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27
Q

Implementation Plan

A

explains how to backup the current system, switch over to the new system, deactivate the old system, activate the old system, migrate data from the old system to the new and disaster recovery

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28
Q

Information Hiding

A

where a class encapsulates its private attributes and methods which are exposed only through its interface

29
Q

JSD

A

Jackson Structure Diagrams

provides an overview of the design using the top-down approach. It breaks the system into components and shows links between them

30
Q

Legal Feasibility

A

whether the technology needed to solve the problem is legal

31
Q

Maintainability Evaluation

A

looks at whether a system will be easy to maintain, whether any modifications or shortcomings have been identified, whether any new modules are needed and whether the data is secure against unauthorised access and complying with any relevant legislation

32
Q

Modular Programming

A

breaking up a program into smaller, more manageable units called modules, with each module responsible for a specific task

33
Q

Module

A

manageable units of code that the main code has been broken up into

34
Q

Object Diagram

A

a diagram to show instances of a class which may be named or anonymous

35
Q

Off the Shelf Software

A

software that can be brought in, generally cheaper and quicker to gain a result from, that may require a chance in how the customer works

36
Q

Parallel Run

A

the old and new system run alongside one another for a period of time. The results and outputs are compared. Once confidence in the new system is gained, the old system can be discontinued

37
Q

Perfective Maintenance

A

improving the system to make it work better, i.e. improving performance or ease of use

38
Q

Phased Changeover

A

one part or module of the system is changed over separately; the new system is then checked before the next part of the system is changed, thus, it may take a long time to changeover the whole system

39
Q

Pilot Changeover

A

the new system is implemented for a few users or places, such as one branch of a nationwide bank; the results from the pilot users are compared to other uses who are still using the old system, and once confidence is gained, the new system is rolled out

40
Q

Problem Definition Document

A

document laying out the issues with the current system that need to be fixed in the new system

41
Q

Problem Reduction

A

the process of generalising or reducing a problem to one that has already been solved

42
Q

Procedural Abstraction

A

the ability to design a well-abstracted procedure that is generalised as far as possible

43
Q

Project Manager

A

oversees the whole project, that all members of the team are communicating, monitors the progress, liases with the team and the customer and ensures the project is completed on tie and on budget

44
Q

Return Code

A

a piece of data sent by function to the point of invocation

45
Q

Requirements Specification Documentation

A

forms a contract between system developer and client user, forming the basis for the next steps in development, test strategies, designs, and needs to be precise and unambiguous because failure to meet requirements means client will not pay for product

46
Q

Screen Scraper

A

the action of using a computer program to copy data from a website

47
Q

Sequence Diagram

A

these diagrams show the flow of program logic and the order in which messages are passed between objects, with vertical dashed lines as timelines, horizontal arrows as messages and rectangles as objects

48
Q

Social Feasibility

A

whether it is socially acceptable to produce a system

49
Q

Software House

A

a company that builds and implements custom software solutions for its clients

50
Q

State Machine Diagrams

A

shows the behaviour of an object during its lifetime

51
Q

Stepwise Refinement

A

another name for decomposition

52
Q

System Evaluation

A

the completed system is evaluated against the original system requirements

53
Q

System Level Response Time

A

time taken to respond when disregarding stuff out of our control

54
Q

Systems Flowchart

A

shows processes and activities to be carried out with storage, inputs, outputs, master and transaction files

55
Q

Systems Lifecycle

A

a method of developing a new system using an iterative cycle made of a series of fixed stage completed in sequence

56
Q

Feasibility Study

A

purpose is to ascertain the problem to solve and whether it is solvable, usually done by a systems analyst or a business consultant, resulting in feasibility study report and problem definition document. The aim is to produce a clear unambiguous description of the problem

57
Q

Systems Analysis

A

involves looking at the current system to find out how it works and its strengths and weaknesses

58
Q

Systems Analyst

A

must bridge the gap between users who are an expert on their problem but don’t understand what a computer system can achieve and developers who are experts in system development but don’t understand the problem

59
Q

Test Phase

A

involves producing and carrying out a suitable testing strategy using a test plan that specifies the tests to be completed. Tests are based on user requirements specification, involve the production of test data and specifies expected results

60
Q

Acceptance Testing

A

where customer test the system

61
Q

Alpha Testing

A

where developers do testing

62
Q

Beta Testing

A

where selected end-users do testing

63
Q

Performance Testing

A

tests that the system runs fast enough

64
Q

System Testing

A

where the whole system is tested at once

65
Q

User Testing

A

test a single code module or program

66
Q

Waterfall Methodology

A

a linear sequential approach to software development

67
Q

Usability Evaluation

A

looks at whether the system is easy to use, what are the training needs of users and have they been met, is online help available and useful, do the users have rapid access to data, and most importantly does the system meet the user requirements listed in the requirements specification?

68
Q

Use Case Diagram

A

a use case is a service that the system can provide; a stickman is shown as the initiator of the service

Computer Science A-Level (17 decks)

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