IST352 - Lab 2 Process Modeling Functional Decomposition(1)

IST352 - Lab 2 Process Modeling Functional Decomposition(1)...

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IST352 – Information Analysis of Organizational Systems Lab 2 Process Modeling – Functional Decomposition Spring 2012 Functional Decomposition In the previous lab exercise we learned the Context DFD process model gave us an excellent starting point for understanding the scope of an information system. It also provided us with all of the external entities (sources/sinks) and their relationship to the system through their individual dataflow. However to build an information system we need much more granularity. We need to determine how each data flow interacts with the individual processes and their associated data stores. To do that we need to use the business rules to create a more detailed level model. The process of creating more successively more detailed DFDs is called functional decomposition. The decomposition process continues until the individual processes cannot be logically broken any further. Each new DFD is called a level. The levels start with Context, then are numbered level 0, level 1 until you can’t decompose any further. When you reach this point you have created a primitive DFD – the lowest level process model. From a programming perspective the primitive DFD represents the programs and data stores that make up an information system. When performing process modeling there are two very important management concepts to keep in mind: 1) process modeling is an iterative process and 2) DFDs are logical models that are independent of the hardware, programming languages, database management systems, operating systems or other software. Materials needed to do this Lab Microsoft Visio Learning Objectives The student will learn: Describe process modeling terminology for: functional decomposition, primitive DFD, level 0 thru level n Explain the management issues associated with process modeling Use the basic functions and features of Microsoft Visio Lab Setup – Establishing Visio Parameters – same as lab 1 Microsoft Visio has an extensive library of functions and features that initially seem overwhelming. This library contains a number of shapes that make it easy for information technology professionals to create process models and represent them as Data Flow Diagrams. So let’s take a look….
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This note was uploaded on 01/17/2012 for the course IST 352 taught by Professor Staff during the Fall '10 term at Syracuse.

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IST352 - Lab 2 Process Modeling Functional Decomposition(1)...

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