week 25 presentation
DESCRIPTION
Ref: Paul Bryon-DaviesTRANSCRIPT
ICT Infrastructure
Round Up of IS Topic
Infrastructure: ICT
Modelling:Information
system
ICT: System
ICT: System: Interface Layer
ICT: System: Rules Layer
ICT: System: Data Management Layer
ICT: System: Transaction Layer
ICT: System: Distribution
ICT: System: N tier
Data: Security: Dimensions
Data: Security: Stored data
Data: Security: Transactions
Data: Security:Personal Identity management
Infrastructure: ICT: Comms: Internet
Infrastructure: ICT: Comms:Internet: History
• Wide area network• Funded by US department of defence• Internet protocol• Packet-switching• Routers
Infrastructure: ICT: Comms:Internet: Packet switch
Sub-networkSub-network
Sub-networkSub-network
Router Router
Packet
Packet
Packet
Infrastructure: ICT: Comms:Internet: TCP/IP
Infrastructure: ICT: Comms:Internet: IP address
Sub-networkSub-network
Sub-networkSub-network
Router Router
Packet
Packet
Packet
126.203.97.54
126.203.97.54126.203.97.54
Infrastructure: ICT: Comms:Internet: URL
126.203.97.54 www.cardiff.ac.uk
Infrastructure: ICT: Comms:Internet: Domain names
www.cardiff.ac.uk
Domain name
Infrastructure: ICT: Comms: Web
Infrastructure: ICT: Comms:Web: History
Infrastructure: ICT: Comms:Web: Components
Infrastructure: ICT: Comms: Web: Site
Infrastructure: ICT: Comms:Web: Web 2.0
• Web-based communities• Collaboration• Blogs, Wikis, Bookmarking, RSS
Figure 9.1: The DeLone and McLean model
DeLone and McLean performed a systematic review of available published material on the question of the success of information systems in organisations.
The DeLone and McLean model
Figure 9.2: The domains of functionality, usability and utility
• Two issues of the use of information systems and the impact of its use are associated with assessments as to the worth or value of an IS
• Elements from the DeLone and McLean model can be grouped into the domains of functionality, usability and utility:
Functionality, usability and utility
Figure 9.3: The domain of use
Content, control and format• A user interface is a collection of dialogues
– Each dialogue is made up of a series of messages between the user and the ICT system
• The user interface is the technology supporting man-machine communication
• There are three major aspects of this dialogue:1. Content 2. Control 3. Format
Figure 9.4: Format, content and
control
Figure 9.5: Examples of questions from a user satisfaction questionnaire
• Assessment of satisfaction with interfaces is often measured using questionnaires made up of a series of attitude questions
• Questionnaire for User Interface Satisfaction (QUIS) is a popular approach and consists of 27 items using a nine-point Likert scale
• This is an example of a series of questions from this type of user interface satisfaction questionnaire
Performance management• Systems exhibit control
– Enabling it to regulate itself and adapt to changes in its environment• Control is a type of monitoring subsystem that controls the behaviour
of other subsystems – Compares their behaviour to defined levels of performance, and acts
• This issue of control is called performance management– The process of measuring past action
• Performance in systems has three main types of measures: 1. Efficacy2. Efficiency3. Effectiveness
Figure 9.7: Efficacy, efficiency and effectiveness
The level of performance an organisation attains is a function of the efficacy, efficiency and effectiveness of the actions it has undertaken.
Information systems evaluation• Evaluation is the process of assessing the worth of something• The figure on the next slide presents a model of information
systems evaluation fitted to the life-cycle of IS development– Illustrates the importance of evaluation to processes of
organisational learning– Distinguishes between four types of information systems
evaluation activity: 1. Strategic evaluation2. Formative evaluation3. Summative evaluation4. Post-mortem evaluation
Managing IS• Informatics Infrastructure Important
– Invest in effective practices for planning, managing, developing and operating it
• Key Areas:– Informatics Planning– Informatics Strategy– Informatics Management– Project Management– Informatics Industry– Informatics Service– Operating the ICT infrastructure– Development Life-cycle– Development Methods, Techniques and Tools
Figure: The development process
• Information system development is a socio-technical system concerned with the design, construction, implementation and maintenance of key aspects of the informatics infrastructure for an organisation
• This critical activity system for modern business is shown in the figure
Developing IS