Input – the data that comes from the environment in which the system will operate. Feedback – an output that is fed back to the system to change the control of the processes.
THE SYSTEM DEVELOPMENT LIFE CYCLE
Ethical consideration is also given to ensure that the system is legally, commercially and socially acceptable. After acceptance testing, the system is implemented (commissioned) in the intended environment.
SUMMARY
2 SYSTEMS ANALYSIS
- REQUIREMENTS MODELLING
- FUNCTIONAL DECOMPOSITION
- IDENTIFYING FUNCTIONS AND PROCESSES
- DATAFLOW DIAGRAM NOTATION
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MASTER IN MANAGEMENT
DRAWING A PHYSICAL DFD
The university technician checks the availability of the item against an inventory list before issuing the item to the student with a credit receipt. This DFD is interpreted as the student booking form enters the system as an entry to.
DFD ERRORS
Data from an external entity cannot be placed directly into a data store - it must be transferred through a process. Download free ebooks at bookboon.com Click on ad to read moreClick on ad to read moreClick on ad to read moreClick on ad to read moreClick on ad to read moreClick on ad to read more moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read more.
DRAWING A LOGICAL DFD
The reason for this is that in a new system, the process can be performed automatically by the system. Download free eBooks at bookboon.com. Click on the ad to read more. Click on the ad to read more. Click on the ad to read more. Click on the ad to read more. Click on the ad to read more. Click on the ad to read more. Click on the ad to read more. per ad to read more Click on ad to read more Click on ad to read more Click on ad to read more
CLICK HERE
- LEVELLED DATA FLOW DIAGRAMS
- THE CONTEXT (LEVEL 0) DIAGRAM
- THE DATA DICTIONARY
- PROCESS SPECIFICATION
- DECISION TREES
- DECISION TABLES
- STRUCTURED ENGLISH
- REQUIREMENTS CATALOGUE
- SUMMARY
It is important that the data flow shown on the lower level DFD matches that shown on the higher level. In and out data flow is identical on the Level 2 diagram to process 1 of the Level 1 diagram.
3 OBJECT ORIENTED ANALYSIS
- OBJECTS AND CLASSES
- USE CASE MODELLING
- CLASS DIAGRAM
- SEQUENCE DIAGRAMS
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EXPERIENCE THE POWER OF FULL ENGAGEMENT…
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RUN FASTER
STATE MACHINE DIAGRAMS
To understand the various states an object goes through during its existence, a state machine diagram, sometimes referred to as a state transition diagram, can be drawn. The state machine diagram shown below represents a college student and the various stages or states they go through.
ACTIVITY DIAGRAMS
To create an activity diagram, consider the order in which the activities occur and consider any conditions that may arise so that all use case scenarios have been considered. If you have produced a physical DFD, this can help identify the sequence of activities.
BUSINESS PROCESS MODELLING
SETASIGNThis e-book
SUMMARY
The analyst can use UML to analyze the system requirements from an object-oriented perspective. This involves producing a set of diagrams that reflect the user's needs and specify the system's requirements.
4 SYSTEMS DESIGN
- DATA DESIGN
- ENTITY MODELLING
- NORMALISATION
- IDENTIFYING RELATIONS
The relationships appear as lines with descriptive labels that connect the entity types on the ERD. This is to ensure that all non-key attributes depend on the key and only on the key.
INVOICE
DATA TABLE STRUCTURES
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HUMAN-COMPUTER INTERACTION
It is important to get early feedback on user interface design from users, and storyboards can be built to facilitate this; these are sketches that show basic screen layouts. Messages should appear in a consistent place on the screen so users know where to look.
SYSTEM ARCHITECTURE
A thin client does very little processing and instead relies on the server to do the processing, which usually results in better performance and lower hardware costs. In a two-tier design, application processing is shared between the server and the client, with all data stored on the server.
NETWORK TOPOLOGY
A disadvantage of a unidirectional ring is that if one node fails, it can prevent the other nodes on the network from working. This central node device connects to all other nodes (devices) on the network and allows the network data to pass through them.
DESIGN DOCUMENTATION
Protocols such as Internet Control Message Protocol (ICMP) are used to establish communication with other devices and to select the route between hosts. With the growth of wireless networking technologies, many organizations are also using wireless local area networks (WLANs) as they save on cabling costs and offer flexibility in terms of connected device numbers and location.
SUMMARY
While much of the content, such as screen layouts, has been reviewed and approved by system users during the design process, other stakeholders, such as IT staff, may need to consider and approve the design. Likewise, management will have to be satisfied with the overall design and implementation implications in terms of cost and personnel.
5 SYSTEMS IMPLEMENTATION
- SOFTWARE DESIGN
- SOFTWARE DEVELOPMENT AND TESTING
- DOCUMENTATION AND TRAINING
- SYSTEM CHANGEOVER
- SUMMARY
The amount and depth of training will vary depending on the level of system use to be undertaken. A further aim is to reflect on the system and suggest any possible future system improvements.
6 SYSTEMS MAINTENANCE
- USER SUPPORT AND TRAINING
- SOFTWARE MAINTENANCE
- SYSTEM PERFORMANCE
- SYSTEM SECURITY
- SYSTEM TERMINATION
- SUMMARY
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7 BIBLIOGRAPHY
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8 APPENDICES
APPENDIX A – COST BENEFIT ANALYSIS
Organizations often set a minimum return on investment, which may be based on the rate they could earn by investing money in other ways, such as an investment bank account. The NPV formula involves multiplying each of the income and expenses by an appropriate present value factor based on the year the income/expenses occurred.
APPENDIX B – NORMALISATION TEMPLATE
Present value tables are available to help with present value analysis, showing values at different rates over several years. Internet calculators are also available (Net Present Value, n.d.) and spreadsheet software such as Microsoft® Excel can be used for calculations.
APPENDIX C – PROJECT MANAGEMENT
Therefore, the critical path is path 3, which is 16 days - the longest path through the network. Download free ebooks at bookboon.com Click on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read moreClick on the ad to read more.
