Behavioral research sometimes aimed at making predictions of relevant behavior. Hence, prediction require the use of two types of variable, the criterion (which is being predicted and is considered as the dependent variable) and the predictor (one used in predicting the criterion and is considered as the independent or controlled variable).
Both predictors and criteria can be measured differently. By using nominal scale (name and labels), ordinal scale (comparison), interval scale (using patterns and has no absolute zero), and the ratio scale (absolute, existing and has absolute zero). These scales are somewhat follows a hierarchical order, nominal scale on the lowest level, and ratio scale on the highest level.
The need for research arises because there are questions need to be answered. Like in science research, it also follows the same steps.
Also, there are six treatment of variables in research:
I. Do not measure:
1. Ignore
2. Randomization
II. Measure under the following conditions:
1. With no manipulation
2. Manipulated by:
a. Holding constant
b. Matching
c. Creating specific levels or categories
Job-related behavior has two primary purposes. First, all psychological research in industrial psychology depends on the measurement of various aspects of behavior in the working environment. Second, certain personnel management functions (such as personnel evaluation) require the measurement in quantitative terms of work-related behavior, such as job performance.
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