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The Importance of Data Models
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| Words: 1300 | Submitted: 07-Feb-2013
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DescriptionData models in Data base management systems
Name an end-user and explain the "problem". Identify the aspects of the problem that you will tackle.
· Explain in detail any relationship between the system you intend to produce and the existing manual system.
· You should have a lengthy interview with your end-user (do not just rely on a questionnaire). Spend time in the working environment and talk to everyone whose working life will be affected by your system. Gather sample documents and include them in your project. Make a full record of any visits/meetings. Then, draw conclusions from these interviews/observations.
· Come up with an agreed requirements specification with your intended user(s). Get the end-user to sign his/her requirements. These will be your performance criteria that will drive the whole project, from this point onwards.
· Identify qualitative and quantitative evaluation criteria (obviously, these should be heavily influenced by the end-user's requirements specification).
· Explain clearly how your system will improve the current system (avoid vague statements such as “to save time”, “to improve efficiency”, “to make system user friendly” etc.)
· Identify those elements of your system that are intended to be "reusable"
· What hardware and software will be used and why?
See http://www.athree.com/access_info/pros_and_cons.html for a description of the pros and cons of Access.
You also need to explain why you will be using Access instead of Excel
· You should show an appreciation of the full potential of the hardware and software that you intend to use.
· List the Inputs, Outputs and Processes. Be very specific about these.
· Fully explain the information flow (include Data Flow Diagrams).
All About Data Flow Diagrams
How to Draw Flowcharts
It is very important that you explain the diagrams. A diagram alone does not fully explain the flow of data.
· Evaluate the user’s current IT skill level and his/her training needs
· Explain how the software will be used.
· Are there any legal, ethical and social issues arising from what you intend to do (e.g. issues of data protection?)
· Consider in detail a range of appropriate approaches to a solution. Why is an Access solution preferable to an Excel solution? Why is a computerised system preferable to a manual system? Why is a relational database better than a flat file solution? Do some basic designs to show how these alternative approaches would work.
· Give compelling reasons for the final choice of solution. Consider the likely effectiveness of your solution.
· Follow a process of Normalization.
· Produce entity-relationship diagrams
See: Drawing Entity Relationship Diagrams using PowerPoint
See: A more complicated description of ERDs and Normalisation
· Break down all envisaged tasks into sub-tasks.
· Create a well defined schedule and ...
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