implementation of information system. implementation in system’s lifecycle it can be done after...
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Implementation of information system
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Implementation in system’s lifecycle
It can be done after the system is designed,
It is one of the most difficult stages,The system changes its owner,The mistakes are revealed..
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Difficulties in implementation..
Depend on:If the system is implemented in new
organization or existing before?It is easier to implement the system in a
new organization.Is the system customized or unique?It is easier to implement the typical
(customized) system.
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Implementation procedure
Total implementation Pilot implementationTrial implementationConcurrent implementation
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Total implementation
New system (resignation of an old system),
The easiest and the cheapest,Dangerous because: there is no way back
(if the system is not tested)
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Partial implementation
Less risk,More expensive (comparing to total
implementiation),Should be structuralised (regions and/or
functions),Pilot implentation is difficult when
subsystems cannot be distincted.
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Concurrent implementation
An old system is being used when the new is being implemented,
Generates conflicts,Expensive.
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Implementation process
PreparationTestingexploitation
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Preparation
sOrganization:Risk definition, assessment and
minimization,Users training,Databases building,Documentation changing,Structure changing
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Preparation
System:System instalation,Appointing supervising team (copyrights),Users training
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Users manual
IntroductionSystem description (parametres),Databases description,Algorithms description,Rules description,Exploitation characteristics
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Preparation
Infrastructure (hardware):Hardware instalation,Computer nets instalation.
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Testing
Testing, checking, examining the system
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Implementation
Preliminary exploitation (trials),Problems elimination
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Exploitation
System exploitation
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Implementation management
Managers are responsible for :Resources allocation,Methods, processes, procedures definition,Tasks sequencing and scheduling,Jobs assignement,Assessment methods definition
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Users participation
Supervisers (least active),Conceptualizer,Member of implementation team (most
active),
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Conflicts
Limited resources sharing,Different aims and tasks,Job sequencing,Different approach to work quality,Different approach to management,Differences concerning age, education,
background,Problems with work organization.m
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Implementation efficiency
DefrostingChanges implementation,Frosting..
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Defrosting
Need for changes,Potential problems..
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Changes implementation
Switching the systems,New system instalation
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Frosting
New balance should be found
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Risk in implementation
Problems with users,Problems with implementation.
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Risk analysis
Discordances in implementation,Corrective action planning,Solutions finding.
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Information in IT systems
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Information in IT systems
DatabasesModels basesProcedures basesKnowledge bases
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Databases
A group of sets used in customers service process,
A database system is to developed to gather, store, process and visualize information,
A database system users include final users, coders, deesigners, systems analytics, databases administrators, data administrators
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Users reuirements
Fast work,Possibilities of development and
reorganization,Accesibility,Efficiency,Safety,Data consistency and independency,Accuracy.
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Models
Simple data,Complex data,Records,Sets.
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Models
General models,Logical models,Physical models.
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General models
Holistic approach to data,Requirements data should meet,Stable,Important for users..
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Logical models
Hierarchical (traditional),Net (traditional),Relative,Object.
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Data warehouse
Subject oriented,Integrated,With data which arenot changed,With data from a long time period,Providing information, and not operation,Analytical, supporting decision-makers.