Cronbach's Alpha is a statistical measure used to assess the reliability or internal consistency of a set of items, such as survey questions or test items. It ranges from 0 to 1, where higher values indicate greater reliability. A commonly accepted threshold for good reliability is 0.70, meaning the items are measuring the same underlying concept effectively. Researchers often use Cronbach's Alpha to ensure that their instruments yield consistent results across different populations or settings. By calculating this coefficient, they can identify whether the items in a scale are appropriately grouped and whether they can be trusted to produce valid results.