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Getting the information into a structure in which it can be processed by the computer is called DATA CAPTURE.(By the way the information i gave you came from my computer book not from me, ok)
If you are bothering to measure it, it probably is not nominal data in your study.
Data Collection is an important aspect of any type of research study. Inaccurate data collection can impact the results of a study and ultimately lead to invalid results.
Statistics.
There are a number of ways, but I would just use an observational study.