RachelDouglas ISIT 470 WINTER hw05

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Apr 3, 2024

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DATA AND PROCESS MODELING Homework 05 | ISIT 470 Systems Analysis & Design SFCC Winter 2024 | Sean Lickfold

WELCOME TO HOMEWORK 05! Before starting this Assignment, make sure to read all the required materials for this module, which can be found in the corresponding module Discussion. Chapter 5 is the second of four chapters in the systems analysis phase of the SDLC. This chapter discusses data and process modeling techniques that analysts use to show how the system transforms data into useful information. Data and process modeling involves three main items: data flow diagrams, a data dictionary, and process descriptions. The deliverable, or end product, of data and process modeling is a logical model that will support business operations and meet user needs.

GLOBE CONSULTING

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QUESTIONS #1-4 You are a senior systems analyst at Globe Consulting, a growing IT consulting firm. You are leading the development team for a major client. You need to explain data and process modeling to your two newly hired junior analysts (Michelle and Aidan) before meeting with the client tomorrow afternoon.

QUESTION #1 Describe the rules for creating DFDs. Context diagram should be drawn so that it fits within a page. Information system name should be used as process name. In each symbol, unique names should be used. Cross lines should be avoided. This can be done by restricting the symbols in DFD. Every process should have reference number and unique name. Feedback and user input should be obtained as possible.

QUESTION #2 What are the data flow and process combinations that must be avoided when creating a DFD? An external entity should not be linked with another external entity. An external entity can’t be connected with a data store. A data store can’t be connected with another data store.

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QUESTION #3 Explain what a diagram 0 is and how it is used. Diagram 0 gives the clear picture of the system (like data flows, data stores and processes). It’s the in-depth representation of the system. It represents systems such as production control, inventory and scheduling. In diagram0, data stores are shown.

QUESTION #4 Ask Michelle and Aidan to review the order system context diagram on page 152, and compare it with the order system diagram 0 DFD on page 159. Then ask them to answer the following questions:

QUESTION #4 (a) How many external entities are shown in each diagram? (b) In each diagram, how many data flows connect to the external entities? (c) How many processes are identified in the diagram 0 DFD? (d) Could the data store have been shown in the context diagram? Why or why not? A. Both the context diagram and diagram0 DFD contains 5 external entities. B. Both context diagram and diagram 0 DFD contains 9 data flows that are connected to external entities. C. Three processes are identified in diagram 0 DFD. D. Yes, data stores have to be shown as the data needs to be stored so that it can be used by the processes in the system.

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FRESH-MART GROCERY

QUESTIONS #5-8 Fresh-Mart Grocery is a regional grocery chain that is developing an information system to monitor inventory levels, product sales, and merchandise turnover. As products are sold in stores, they need to be replaced by shipments from the distribution centers. The IT manager wants you to document a process called BALANCE that determines whether extra product inventory is needed in a particular store. The BALANCE process is to be used in a just-in-time inventory system that automatically orders products and routes them to various stores for sale. A store manager can override the automatic BALANCE process if he or she so desires to get more product into a store.

QUESTION #5 Create a decision table that describes the movement of inventory. RULES 1 2 3 4 Product Sold? Y Y Y N Inventory Still OnHand? Y N N - Supervisor override? - Y N - Order More Product X X - - Do Not Order Product - - X X

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QUESTION #6 Draw a decision tree that describes the merchandise inventory management process.

QUESTION #7 Name four attributes that you can use to define a data flow in the grocery inventory information system. 1. Documenting processes 2. Documenting the entities 3. Documenting the records 4. Data dictionary reports

QUESTION #8 Name four attributes that you can use to define a data store in the grocery inventory information system. Data store name or label: The data store name as it appears on the DFDs. Alternate name (s): Aliases for the DFD data store name. Description: Describes the data store and its purpose. Input data flows: The standard DFD names for the data flows entering a data store.

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RachelDouglas ISIT 470 WINTER hw05

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