This paper demonstrates that the widely available and routinely used index 'coefficient alpha if item deleted' can be misleading in the process of construction and revision of multiple-component instruments with congeneric measures. An alternative approach to evaluation of scale reliability following deletion of each component in a given composite is outlined that can be recommended in general for scale development purposes. The method provides ranges of plausible values for instrument reliability when dispensing with single components in a tentative composite, and permits testing hypotheses about reliability of resulting scale versions. The proposed procedure is illustrated with an example.

中文翻译：

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可靠性（如果已删除），而不是“ alpha（如果已删除）”：删除组件后评估秤的可靠性。

本文证明，广泛使用和常规使用的索引“如果项目被删除，系数α”可能会在构造和修订具有同类措施的多组件工具的过程中产生误导。概述了在给定复合材料中每个成分删除后评估量表可靠性的另一种方法，通常可以推荐用于量表开发目的。当在暂定复合材料中放弃单个组件时，该方法提供了仪器可靠性的合理值范围，并允许测试有关最终量表版本可靠性的假设。举例说明了所建议的过程。