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The reliability of a construct that consists of several items can be assessed with Cronbach’s Alpha, a measure of the internal consistency of a construct or scale. Important is that the items that are selected for the analysis all relate to a single construct and all have the same coding. For example, if the items contain the answers 1 to 5, where 1 means “totally disagree” and 5 “totally agree”, a score of 5 on all items should also mean a high score on the underlying construct. If this is not the case for some items, they should be recoded first. High Cronbach’s Alpha values (> .80) indicate high reliability or high internal consistency. This means that the items all measure the same underlying construct. Values below .50 indicate insufficient reliability. In general, a scale with a Cronbach’s Alpha above .70 is considered reliable.

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