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44 Cards in this Set

  • Front
  • Back
Systems analysis
Analyze, Evaluate, Recommend
is a discipline which analyzes problems, evaluates the consequences of various courses of action, and recommends what action to take to solve problems.
Information systems analysis
seeks to improve information systems so that they provide better support for the business activities of an organization.
How do humans cope with complexity?
by thinking in terms of systems.
What does a system do?
Structures Separates
organizes its components into a structure and is separated from its environment by a system boundary.
Why do system analysts work with abstract models?
Understand existing systems,
Simulate system behavior, and
Describe the requirements for a new system
information systems perform three functions, what are they?
Transmission of information
Storage of information
Transformation of information
The important overall function of an information processing system is ...
to respond to what happens in the outside world by transforming inputs into the desired outputs
How do system analysts help solve business problems?
by applying information technology not only to production and service functions but also to improved monitoring, control, and decision support.
In order to structure and simplify complexity, we:
Limit the extent of our interest
Select only the important or essential features
Break up the complexity into manageable small pieces
Examine things iteratively
Review and refine in order to improve
Use visual thinking whenever we can
What Is a System?
is an interrelated set of components which are viewed as a whole.
A system has which 4 things?
Components – its basic parts
Structure – how the components are organized
Function – what the system does
Objectives – the human purposes served by the system
3 System Structures
Hierarchical (Tree)
Matrix (Grid)
Hierarchical (Tree)
Each component is subordinate to exactly one other component.
Components can be nested.
Matrix (Grid)
Each component, or cell, is determined by a combination of two or more factors.
Nodes or points connected by arcs or links.

Arcs may permit flows, as in a transportation or telecommunication network.
Hierarchical System Structure
Hierarchical System Structure
Network System Structure
Network System Structure
A System and Its Environment
A System and Its Environment
which separates a system from its environment.
A system has which two things?
An environment and a boundary
A Systems View of Business
A Systems View of Business
A Systems View of Business Flow
A Systems View of Business Flow
An interface describes ...
an interaction or connection between a system and its environment, or between subsystems
A system model is ...
an abstract, selective system description used to:
Understand the system
Study system behavior
Communicate our understanding of the system to others
A representation of a model is a ..
graphical or physical way of displaying the components and relationships in the model.
We generate a system model through:
Assembling a system out of a set of elementary components, or primitives, through synthesis – a bottom-up process.
Partitioning the whole into its constituent parts through analysis – a top-down process.
3 Functions of an Information Processing System
Moves or transports information from place to place
Records and saves information for future use
Changes information content by deriving outputs from inputs using a known, defined procedure
2 Essential Pieces of Automated Information Processing Systems
Data capture and display devices
Processing units
Memory (volatile and permanent)
Channels for information flow
Operating system and related software
Communications software
Application software
2 Types of System Descriptions
Implementation Descriptions
Essential Descriptions
Implementation Descriptions
Dependent on a specific implementation or technology
Sometimes called physical descriptions

Shows form
Essential Descriptions
Independent of a specific implementation or technology
Sometimes called logical descriptions

Shows content
4 Roles of Information in Business
It helps carry out the production and service functions of the organization.

It measures and monitors the performance of these primary business functions and other supporting functions.

It helps the organization control its operations to meet performance targets.

It supports management decisions to improve the business by modifying the organization or changing its objectives.
8 Major Steps in the Problem-Solving Process
Identify the problem.

Generate possible solutions.

By applying constraints, eliminate proposals which do not solve the problem.

Using the criteria, compare the alternatives to select the best solution.

Plan how to implement the selected solution.

Implement the solution.

Evaluate the performance of the solution after its implementation

Evaluate the expected performance or behavior of each proposed solution.
System analysts apply information technology to ...
business problems and systems in order to improve production and services as well as provide improved monitoring, control, and managerial decisions.
Basic systems concepts and models help analysts succeed in addressing ...
the complexity of real-world systems.
Matrix System Structure
Matrix System Structure