Download Systems Design

Systems Design
Systems Design Skills
• People skill (25%) - Listening, understanding others, understanding
between two lines, conflict resolution, handling the
communications gaps, reporting, walk through, reviews.
• Communication Skills (20%) – Oral / Written communication
• Documentation skills (30%): Knowledge capturing, diagrams, charts
(structure charts, Gantt charts, Business knowledge (business
processes, business management knowledge)
• Technical skill (25%) - Database design, programming, web design
etc.
Stakeholders of the system
Proposed System: Web based
Stakeholders of the system
• System users (key players), Chief Analyst/Chief Project
Manager
• Project Oversight Committee, Project team – Project
managers, Team leads, Business Systems Analysts
• Management, executives, customers, distributors
• Employees, Clients, External help (say consultants)
System design activities
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Determining what changes will be needed to the existing system
Forming design teams
Choosing software system/ applications software to support web services
Database design- Decide how to store and access data- Integrate the database
Changes to company network- Design and integrate the network
Choose hardware to support new system
Decide on operating system, programming languages, tools
Determining compatibility of above and existing system
Architectural Design, Division of Labor, Develop Strategies for proceeding, working in parallel
Design the application architecture (Process design)
Design the user interfaces
Design the system interfaces
Design Web-supported services
Design Prototype
Design and implement system controls
Monitoring the progress of the project / Controlling the project issues & risks
etc.
Systems Design Decision
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Hardware
Operating Systems
Database
Programming Language
User interface
System Interface
Network Interface
Others
Hardware Options
• Existing hardware
• New hardware- Mainframe, Client/server
architecture, virtual server, clustered, etc.
• Brands: Lenovo, Dell, CISCO, IBM, HP, 3COM,
DLINK, LINKSYS
Options for Operating systems
• Windows, Linux, Mac/OS, Linux or UNIX for
the web server and database, Windows XP,
Windows Vista, Windows NT, Windows Server,
Linux, Unix OS AIX, BSD etc.
Database
Options
• Oracle, DB2, Access, mySQL, SQLite, CouchDB,
depends on the load, (Consider existing and
future requirements)
Options for Programming Languages
• Java, Java Scripting (for user interaction),
Java2 Web services, J2EE, C, C#, Pearl, COBOL,
ABAP, Microsoft.NET, SOAP, AJAX, PHP,
embedded SQL, COM+, CORBA, SOAP, Pythan,
Ruby, Haskell, Smalltalk, Erlang, BASIC, Visual
Basic, D, LISP, and others.
The outputs of design activities
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Diagrams that describe architecture of new/ proposed system and detailed logic of programming
components.
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Architectural Design:
A plan for the design of the system
Division of Labor:
Who to do what (Gantt chart)
Develop Strategies:
Critical Path and/or Pert chart.
Ways of monitoring the budget, time, and the project resources.
Process Design
• Data flow diagrams, Structure charts, Class diagrams, Interaction Diagrams
Interface Design
• User interface design, Dialogues, Forms, Reports
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GUI, Sound, Video, Voice, story boarding
• Integration between new and existing databases
Prototype (Working)
The outputs of design activities
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Determining what changes will be needed to the network
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Designing the database
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A list of changes
Modified network
Nodes- location diagram
A database
How we will store and access data
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List of database options
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Deciding system security & control
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Forming design teams
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Deciding what hardware will support the new system
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List of hardware needed to support the system
Deciding what operating system will be used
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A design team and their tasks
Assigning specific tasks to employees
List of operating systems
Deciding what languages and tools we will use
List of programming languages
The documents generated out of systems design
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Database Design: Entity Relationship Diagrams, Query Report Design.
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Process Design: Functional Decomposition Diagram, Event Table, Structure Charts, Flowcharts, Context Diagrams,
Data Flow Diagram, Decision Charts, Gantt Charts
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Software Design: Module Diagram, pseudo-code.
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A plan for the design of the system:
Who to do what (Gantt chart):
Critical Path and/or Pert chart:
Doing the work on budget and on time:
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RFP for Software packages, RFP for hardware support
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Object oriented design documents: Activity diagrams, Use-case diagrams, Event tables, Software Design
(Structured/ conditional/ Iterative), Design class diagrams, Object database schema
Blueprint
Gantt chart
Pert Chart, CPM chart
Tracking Gantt
Project management activities during systems design
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Prevent, anticipate and/or overcome problems to complete the project scope on
schedule, within budget, and to the customer’s satisfaction
Activities: planning, meeting with steering committee, deciding and delegating
tasks, meeting with project teams, Tracking, organizing people and resources.
Manage changing requirements
Coordinate design elements
Coordinate project teams
Oversee decisions
Coordinate Information
Keeping client up to date with progress
Oversees project teams
Keeps project on budget
Monitor progress of the project
Manage the project-scope, people, cost, time, resources etc.
The teams involved during systems design
• Oversight committee, hardware team, application
software team, interface design team, operating
system team, Network Specialists, web support
services team, database design team, Project
Management Team, Process Design Team, Project
Support Team
• End Users Evaluation Group, Integration Team,
Support Team, Development teams, Change
management teams.
How do the teams collaborate?
• Meetings, group discussions (explore options),
email, phone, Conference calls, shared network
drives, inter-office documents/memos.
• NetMeeting, Fax, Instant Messaging, Face-to-face
Meeting (periodic), interviews
• JAD