Concerning the internal consistency reliability, can the internal consistency reliability of a scale used to measure relapse behaviour of a drug user be affected by the number of items in the scale, and how?

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Yes, definitely. The internal consistency reliability of a scale used to measure relapse behaviour of a drug user can be affected by the number of items in the scale. Increasing the number of items can improve the internal consistency reliability if the items are measuring the same construct, but can also decrease reliability if the items are measuring different constructs.