Applicability refers to the relevance or suitability of a concept, rule, or method in a specific context or situation. It determines whether something can be effectively used or implemented in a given scenario. For example, the scientific method is applicable in various fields, such as biology and psychology, to conduct research and gather data. In practical terms, understanding applicability helps individuals and organizations make informed decisions. By assessing the applicability of a tool or strategy, one can identify its potential benefits and limitations. This is crucial in areas like business, where choosing the right approach can lead to success or failure.