Implementation of information system

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..

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.

Implementation procedure

Total implementation Pilot implementationTrial implementationConcurrent implementation

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)

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.

Concurrent implementation

An old system is being used when the new is being implemented,

Generates conflicts,Expensive.

Implementation process

PreparationTestingexploitation

Preparation

sOrganization:Risk definition, assessment and

minimization,Users training,Databases building,Documentation changing,Structure changing

Preparation

System:System instalation,Appointing supervising team (copyrights),Users training

Users manual

IntroductionSystem description (parametres),Databases description,Algorithms description,Rules description,Exploitation characteristics

Preparation

Infrastructure (hardware):Hardware instalation,Computer nets instalation.

Testing

Testing, checking, examining the system

Implementation

Preliminary exploitation (trials),Problems elimination

Exploitation

System exploitation

Implementation management

Managers are responsible for :Resources allocation,Methods, processes, procedures definition,Tasks sequencing and scheduling,Jobs assignement,Assessment methods definition

Users participation

Supervisers (least active),Conceptualizer,Member of implementation team (most

active),

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

Implementation efficiency

DefrostingChanges implementation,Frosting..

Defrosting

Need for changes,Potential problems..

Changes implementation

Switching the systems,New system instalation

Frosting

New balance should be found

Risk in implementation

Problems with users,Problems with implementation.

Risk analysis

Discordances in implementation,Corrective action planning,Solutions finding.

Information in IT systems

Information in IT systems

DatabasesModels basesProcedures basesKnowledge bases

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

Users reuirements

Fast work,Possibilities of development and

reorganization,Accesibility,Efficiency,Safety,Data consistency and independency,Accuracy.

Models

Simple data,Complex data,Records,Sets.

Models

General models,Logical models,Physical models.

General models

Holistic approach to data,Requirements data should meet,Stable,Important for users..

Logical models

Hierarchical (traditional),Net (traditional),Relative,Object.

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.