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Data Naming [ 28 ] At this point, a consensus must be reached by convincing users about the importance of standard terms. It must become clear to everyone that the term car_number is not precise enough to be used, so it will be replaced by car_internal_number …….in the data elements list, probably also in any user interface (UI) or report. It can be argued that car_internal_number should be replaced by something more appropriate; the important point here is we merged two synonyms: car_number and stock_number,……………………………………………………….. and established the difference between two elements that looked similar but were not, eliminating a source of confusion. Therefore we end up with the following elements: Car_serial_number Car_internal_number (former car id number and stock number) Eventually, when dealing with data grouping, another decision will have to be taken: to which number, serial or internal, do we associate the car’s physical key number. Subdividing Data Elements In this section, we try to find out if some elements should be broken into more simple ones. The reason for doing so is that, if an element is composed of many parts, applications will have to break it for sorting and selection purposes. Thus it’s better to break the elements right now at the source. Recomposing it will be easier at the application level. Breaking the elements provides more clarity at the UI level. Therefore, at this level we will avoid (as much as possible) the well-known last-name/first-name inversion problem. As an example for this problem, let’s take the buyer’s name. During the interview, we noticed that the name is expressed in various ways on the forms: Form How the name is expressed Delivery certificate Mr Joe Smith Sales contract Smith, Joe We notice that There is a salutation element, Mr The element name is too imprecise; we really have a first name and a last name On the sales contract, the comma after our last name should really be excluded from the element, as it’s only a formatting character
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