IB Computer Science Topic 1
Terms in this set (40)
SaaS (Software as a Service)
software distribution model in which applications are hosted by a vendor or service provider and provided to customers over a network
The four types of changing to a new system
parallel running, pilot running, direct changeover and phased conversion
both the old and new system run at the same time
one section of the business is trying out the new software while one keeps using the old one
moving straight from the old to new system
slowly implementing the new software
User Acceptance Testing
the last phase of software testing in which actual software testers test the software in real world scenarios
identifying and removing errors from computer hardware and software
real world exposure for the product to get feedback from users
Documentation to support users of computer systems including hardware and software
Methods of user documentation
help files, online documentation, printed manuals
Possible causes of data loss
user error, malicious actions of a third party, theft, viruses/malware, hardware malfunction, natural disaster
Consequences of data loss to individual users
can lose personal information (ex. address, social security number, health information or bank account information)
Consequences of data loss to companies
can lose reputation/customers, may be sued/have to pay fines
Methods of preventing data loss
create a backup, RAIDs (ex. data mirroring), antivirus softwares, physical security
Strategies for managing/releasing updates
automatic updates, manual updates
anything within a computer that you can physically touch
collection of programs and instruction that control the computer
devices attached to the computer that allow interation and the exchange of information (ex. keyboard, mouse, screen)
a group of computers connected toether to share resources such as documents and printers
the humans operating the computer
help people interact with the computer system and manage how the hardware, programs and data interact
a computer accessing resources hosted by another computer/the server
a computer hosting resources to be shared across the network
protects the network traffic, decides what gets access and what doesn't
Benefits of surveys
little time, simple, large amounts of data
Drawbacks of surveys
hard to ask the right questions
Benefits of interviews
Drawbacks of interviews
Benefits of direct observations
first hand, unbiased information
the study of people's efficiency in their working environment
how the system can be accessed for information exchange and operation
Ways to improve the accessability of a system
touch screens, voice recognition, text to speech, braille keyboards, braille printers
is a set of interacting parts that operate together to achieve some objective or purpose.
The three stages of a System
Input Process Output
Things organizations need to consider when changing computer systems
needs, limitations, user roles, cost, underlying technologies.
Why change management is required
Accomplishes change in the most efficient manner while minimizing the impact on an organization.
Provides training and support for staff.
Ensures that a consistent approach to change is used.
Ensures that proper planning, designing, and testing of proposed change has occurred.
Lowers the total cost of IT services.
A legacy system
is an outdated computer system, programming language or application software that is used instead of available upgraded versions
Legacy system compatibility issues
Will legacy software run on new hardware?
Is the format of the legacy system data compatible with new software?
Can the legacy system be used with new technologies?
Business merger compatibility issues
Is the data from each company compatible?
How is the data from each system going to be integrated?
Transformation of data from one system to another.
Companies may not be using same application software.
Businesses may not have same change management policies.