By Hans van der Heijden
Administration details platforms (MIS) produce the data that managers use to make vital strategic judgements. This e-book covers the basic managerial talents which are essential to layout those structures. not like different books on administration info structures, this ebook takes a decidedly managerial viewpoint. It makes a speciality of how managers understand and reply to info, and on their have to use this data to make vital decisions.The ebook considers how structures might be designed to strive against 'information overload' skilled via managers, utilizing such recommendations as info aggregation and information visualization. Chapters supply an in-depth and sensible attention of those subject matters, concentrating on using info systesms for managerial selection making. Designing administration details platforms covers the subjects of key functionality indicator tracking, and of shortlisting and choosing possible choices from a number of thoughts. those are managerial judgements for which MIS are rather necessary, and which managers face every day. this is often the 1st ebook delivering sensible tips on how platforms will be designed to help those decisions.It is written for managers, these learning enterprise, administration, and IT, and people constructing MIS on behalf of administration.
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In that process you often have a number of choices. Take Joe for example. He could be representing the entity Sales Agent, but also the entity Person, Customer, and so on. These examples are not even mutually exclusive: Joe could happily represent all these and more. You should look very carefully at your managerial domain to guide you in the selection of the appropriate entities. In your Entity–Relationship diagram you would draw the entity as a rectangular box with the name of the entity in the box.
We now shall discuss two additional endings for these types of relationships. These two endings are the circle (or ring) and the dash. The circle is representing ‘zero’ and the dash is representing ‘exactly one’. We use the circle and the dash to say something about the optionality of the relationship. STRUCTURING DATA, PART 1 29 Entity A Entity B An instance of A can be related to many instances of B Entity A Entity B An instance of A is always related to one or many instances of B Entity A Entity B An instance of A can be related to one instance of B Entity A Entity B An instance of A is always related to one instance of B Figure 5 Extra endings for ER relationships The circle is meant to indicate that a zero relationship is allowed.
In this chapter we will be building on this material and discuss an important alternative to ER diagrams, UML class diagrams. The Uniﬁed Modeling Language or UML is a diagramming language that, among other things, recasts entities into classes. The fundamental notions of entities and classes are very similar, but the terminology is slightly diﬀerent. I will discuss the UML concepts in a bit more detail in this chapter, because you will frequently encounter class diagrams instead of ER diagrams.