Objectives: Introduction Over View of System Analysis and Design

The data collected during the fact – finding study and included in data flow and decision analysis documentation are examined to determine how well the system is performing and whether it will meet the organization’s demands. Identification of Essential Requirements Features that must be included in anew system, ranging from operational details to performance criteria, are specified. Selection of Requirements Fulfillment Strategies The methods that will be used to achieve the stated requirements are selected. These from the basis for system design, which follows requirements specification. All three activities are important and must be performed correctly.



6.2.2 Basic Requirements
Analysts structure their investigation by seeking answers to these four major questions What is the basic business process What data are used or produced during that process What are the limits imposed by time and the volume of work What performance controls are used

6.2.3 Understand the Process

Begin with the basics. Analysts must raise questions that, when answered, will provide a background of fundamental details about the system and describe it. Asking the following questions will help acquire the necessary understanding. What is the purpose of this business activity What steps are performed Where are they performed Who performs them How long does this take

How often is it done Who uses the resulting information Suppose you are reinvestigating an inventory reordering system, something about which you know very little. Where should you begin Listed below are brief answers to basic questions about the inventory reordering system. These are the kinds of answers you would need to seek for any system you were studying. What is the purpose of inventory reordering To ensure that adequate quantities of stock and materials are on hand and available for use without carrying an excessive and therefore costly quantity. What steps are performed Verifying stock on hand. Determining future requirements and optimum times to place orders. Determining quantities to order. Where are they performed The purchasing department, using information provided by manufacturing, sales, and inventory staff members, as well as by its own records, handles ordering and lead – time. Projection. Who perform them Purchasing manages approve all orders. Stock managers assemble buying instructions and write orders. How long does this take The process may take a few minutes for simple and routine high – prices item or other special circumstance. How often is it done This is a continuous process. Different items are always being ordered.

Who uses the resulting information Information produced as a byproduct of this process is used to manage inventory, schedule service and manufacturing monitor purchasing, and pay suppliers, as well as meet unexpected requirements for purchasing and inventory reorder information. Notice how quickly answers to these questions provide abroad understanding of what inventory reordering is all about and show that the objective of inventory reordering is more than just buying stock. But analysts cannot stop here. There is not yet enough information to fully understand inventory reordering. Instead, the background acquired enables to raise more detailed questions.

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