|2002年10月 1日||DATA-ANALYSIS||BACK >> 目次|
● Data sources
T-formed ERD is a diagram of how you do business activities, for it collects and analyzes the real data, all the available data in business activities.
The data comes from various sources:
Note: informal data
Once we finish data-clustering (with formal and informal data), we're expected, now, to form a diagrammatic representation on paper of the ERD.
Events are disposed (vertically) in historical order; resources are placed above and below the events--it makes no sense to put the resources, if any, in alphabetical order.
Before you get started with the creation of relationships among entities, you should count up the events and resources; you can conduct an early diagnosis of business activities by "palpation" of data.
□ If the events outnumber the resoruces,
It is admitted that, with many events and with a good flow of events, we can achieve the efficiency of our work, and that greater efficiency can bring higher productivity. It will be, however, coming to an end sooner or later as it's getting to the maximum level where you stay put in status quo ante and the (flow of) events may be exposed to a danger of obsolescence with the change of the times.
□ If the resources outnumber the events,
An event is a vehicle of resources [ R(a, b) ], and how about doing it the other way around and creating a new event with a new combination of two resources, and you can get a new event or a new business chance with the (existing) resources.
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