Assess_Task_3

=Assessment Task 3=

Task:


Resources:

Class questions:

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Creating a Gantt Chart in Excel
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Creating a Context Diagram




Context diagrams
A context diagram is a graphical representation of a system which must only use one process to represent the entire system and deliberately does not go into defining all the processes so as to prevent people getting bogged down in complex details at an early stage. There are only three symbols used in a context diagram: Many students find Context Diagrams confusing because they are so much like a DFD. This is is easy to explain because a context diagram is a level 0 DFD. This is the most basic type of DFD where all the processes and storage is represented by a single process. NOTE: context diagrams do not have storage. DFDs will always have storage. Systems analysts draw data flow diagrams in several nested layers. A single process Context diagram can be expanded to show a more detailed data flow diagram. In the next level DFD the single process of the Context Diagram is broken down into several main processes and must include storage which previously was lumped inside the single process of the Context Diagram. Each successive layer is systematically broken down into more processes. This process can continue until the required level of detail is found. []
 * A circle to represent the system in terms of a single process. There will never be more than a single process in any context diagram,
 * arrows to represent data flow,
 * and a rectangle to represent any external entities affecting the system. There can be numerous external entities.
 * Source: HSC Online**

Feasibility Study
Feasibility studies analyse potential solutions in terms of known constraints: A project plan must provide an overall schedule for the project and a schedule for each subproject. The roles of participants, information technology and data/information required by the system must be identified. Projects that do not run to schedule can incur significant increases in costs. A useful tool for scheduling is a Gantt Chart.
 * technical feasibility - determines if the required information technology available
 * economic feasibility - compares the costs of development with expected benefits
 * organisational feasibility - determines if the new system will be accepted and support the goals of the organisation
 * schedule feasibility - determines if adequate time is available to implement the new system

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 * Source: HSC Online **

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Tutorial 2
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Tutorial 3
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Tutorial 5
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Learning Dreamweaver CS 5.5
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