CS1601 business module
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31 Terms
What is a system?
A collection of parts and components
3 facts about systems?
There is structure and interaction between components that is coherent
There may be external interactions such as inputs and outputs
Has purpose
Open systems
Exchange inputs/outputs with their environment
Closed systems
Do not interact with their environment
Subsystems
A division of systems into components
Information
Data that is processed with a purpose, for decision making
Information systems
A system that provides information to businesses to make decisions and support activities
TPS
Transaction processing systems, information systems that are used at a lower level
Day to Day transactions
Three words to describe TPS are?
Functional
Deterministic
Routine
A business process
A process that consists of one or more activities carried out in a specific order
What are the managerial levels?
Supervisory
Middle
Executive
MIS
Management information system, takes data from TPS and produces summaries and statistics. Middle level
DSS
Decision support systems, the highest system that uses data from TPS & MIS to support unstructured decisions
ES
Expert systems, powered by AI and used to mimic human decision making
Examples of what TPS does
Data capture
Validation
Processing
Record updating
Examples of what MIS does
Collects & summarizes data
Generates reports
What are the 5 activities of the system lifecycle?
Analysis, design, implementation, validation, maintenance
Functional requirements
The basic concept of the system
Non-functional requirements
How the system completes its task
Method of establishing requirements
Gather
Analyse
Specify
Validate
The analyst
Translates business and user needs into the system
Statement of scope
A statement about the function of the system
Definition of a use case
Describes how a user interacts with a system to achieve a goal
Features of a use case
Primary actor
Goal
Scope
Sequence
Casual use cases
Follow the typical structure
Fully dressed use cases
Have more detail in the structure
A supporting actor
External persons that assist the use case process
Trigger & pre-conditions
What causes the transaction to occur, and what is required to happen before it takes place
Participation
Can the entity exist without participation within a relationship?
Candidate key
Attributes that uniquely identify an entity