kendall7e_im_ch15 - Chapter 15 Systems Analysis and Design...

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Chapter 15 Systems Analysis and Design Instructor's Manual 15-1 1 Chapter 15 Designing Accurate Data Entry Procedures Key Points and Objectives 1. The quality of data input determines the quality of information output. Systems analysts can support accurate data entry through the achievement of four broad objectives: effective coding, effective data capture, efficient data capture and entry, and assuring quality through validation. 2. Coding aids in reaching the objective of efficiency, since data that are coded require less time to enter and reduce the number of items entered. Coding can also help in appropriately sorting data during the data transformation process. Additionally, coded data can save valuable memory/storage space. 3. Besides providing accuracy and efficiency, coding has the following purposes: A. Keeping track of something. B. Classifying information. C. Concealing information. D. Revealing information. E. Requesting appropriate action. 4. Types of codes are: A. Simple sequence code B. Alphabetic derivation codes C. Classification codes D. Block sequence codes E. Cipher codes F. Significant digit subsets G. Mnemonic codes H. Function codes 5. Unicode is a standard means to represent glyphic characters or symbols used in other alphabets. 6. In establishing a coding system, systems analysts should follow these guidelines: A. Keep codes concise. B. Keep codes stable. C. Make codes that are unique. D. Allow codes to be sortable. E. Avoid confusing codes.
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Chapter 15 Designing Accurate Data Entry Procedures 15-2 F. Keep codes uniform. G. Allow for modification of codes. H. Make codes meaningful. 7. Codes are used in validation programs to ensure that only valid codes have been entered, in report and inquiry programs to display code meanings, and in GUI programs to create drop-down lists. 8. In order to assure the quality of data entered into the system, it is important to capture data effectively. The following list provides guidelines to be remembered for the effective and efficient data capture: 9. Data entry methods include keyboards, optical character recognition, magnetic ink character recognition, mark-sense forms, and bar codes. 10. RFID, radio frequency identification, allows the automatic collection of data using RFID tags or transponders that contain a chip and an antenna. RFID tags can be passive or active. 11. Although effective coding, and effective and efficient data capture and entry, are necessary conditions for assuring quality data, they alone are not sufficient. Additionally, to assure data quality, errors should be detected during input, prior to processing and storage. Two possible ways to validate inputs are: validation of input transactions and validation of input data.
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