Many online data entry devices are CRT screens that provide instant visual verification of input data and a means of prompting the operator. Operator can make any changes desired before the data go to the system processing. A CRT screen is actually a display station that has a b (memory) for storing data. A common size display is 24 rows of 80 characters each or 1,920 characters.
There are two approaches to designing data on CRT screens: in. and software utility methods. The manual method uses a work sheet m like a print layout chart. The menu or data to be displayed are blocked in the areas reserved on the chart and then they are incorporated into system to formalize data entry. For example, in the first command in the partial program is interpreted by system as follows: "Go to row 10 and column 10 on the screen and display (SAY) the statement typed between quotes." The same applies to the three commands. The command "WAIT TO A" tells the system to keep menu on the screen until the operator types the option next to the word.
"WAITING."
The main objective of screen display design is simplicity for accurate and quick data capture or entry. Other guidelines are:
1. Use the same format throughout the project.
2. Allow ample 3pace for the data. Overcrowding causes eye strain and may tax the interest of the user.
3.Use easy-to-Iearn and consistent terms, such as "add," "delete,' and "create."
4. Provide help or tutorial for technical terms or procedures.
The second approach to designing screen layouts is through so utility, usually provided by the CRT vendor. For example, IBM provides a screen Design Aid (SDA) package that allows the designer (at the terminal) to modify the display components.
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