Comp Sci Unit 1 (1.1.1 - 1.1.14)

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55 Terms

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What makes a new system feasible?

Technical, economic, legal, operational, schedule feasibility

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Change Management

The transition of shifting the client from an old system to a new one

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What makes change management difficult?

  • Employee Training
  • How the system will be implemented
  • Cost
  • Layoffs
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Legacy system

old technology, hardware, computer system, or application

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Business merger

Combination of 2+ businesses

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Keep both systems to have the same functionality

High maintenance cost

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Replace both information systems with new one

Increased initial cost

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Select best information systems from each company and combine

Difficult for employees

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Select just one company’s information systems

Policy problems

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Local host

Larger and complex systems

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Remote host

No necessary hardware
Administration to outsource responsibilities

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Software as a Service (SaaS)

Services on the web

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Pros of (SaaS)

Cheaper to maintain, subscription service

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Cons of (SaaS)

Data loss if company goes out of business, connection may be worse, integration is difficult

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Direct installation process

Unplug old system and plug new system simultaneously

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Pros of direct installation process

Quick and cheap, if the system is not critical

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Cons of direct installation process

Risky

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Parallel installation process

Run both systems at the same time, unplug the old one when satisfied

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Pros of parallel installation process

Limited risk, outputs can be compared

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Cons of parallel installation process

Expensive, unhelpful if new system is different

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Phased installation process

Upgrade one module of the system at a time

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Pros of phased installation process

Limited risk, good for big systems

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Cons of phased installation process

Training and adoption takes long, doesn’t always apply

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Pilot installation process

New system in one site, extended to others over time

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Pros of pilot installation process

Less risk, proof of concept

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Cons of pilot installation process

Sites may be different, doesn’t always apply

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Data migration

The transfer of data between different formats, storage types and computer systems

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Problems of data migration

Incapability to move data due to different systems/languages

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Ways of testing

Test commands, inputs, menu functions

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Use of testing functions

To see if the functions work and to fix them accordingly

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Importance of user documentation

Allows the code to be more organized and understandable

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Pros of self instruction

Cheap, Quick, Flexible

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Cons of self instruction

Less focus, less help, less learning

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Pros of formal class

In depth, teacher assistance

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Cons of formal class

Expensive, Long

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Pros of Online classes

Individual, in-depth, anywhere

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Cons of Online classes

Expensive, Errors, Time consuming

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Causes of data loss

Malicious Activity, Natural Disasters

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Malicious Activity examples

Internal activity by employees, destruction, viruses

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Natural disaster examples

Floods, earthquakes, fires

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Consequences of data loss

Loss of records, data and information

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Pros of manual updates

Can be printed and kept on hand

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Cons of manual updates

Harder to look up information can’t help with very specific problems

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Pros of email support

Can help with specific problems

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Cons of email support

Takes a while to get a response

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Pros of frequently asked questions

No one required to assist

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Cons of frequently asked questions

Might not have an answer to your specific question

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Methods used to prevent data loss

Failover, redundancy, removable media, offsite/online storage

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Failover

When a standby computer is used while the primary computer is unable to work

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Redundancy

Duplicating data to another computer to prevent loss if the primary computer becomes unable to work

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Removable Media

Storing data on an external device such as a USB, or disk, and can be used on multiple computers

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Offsite/Online Storage

Storing data offline with an encryption key / Storing data online on sites like Google drive with an encryption key

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Strategies for managing releases and updates

Manual, Automatic updates

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Manual updates

User gets notified on the update
User can decide if they want to update
They must allow the update to work

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Automatic update

Application constantly checks for updates
Users does not need to confirm update
User does not need to go through the process of updating