Look up efficacy in Wiktionary, the free dictionary. Efficacy is the ability to perform a task to a satisfactory or expected degree. The word comes from...

In psychology, self-efficacy is an individual's belief in their capacity to act in the ways necessary to reach specific goals. The concept was originally...

Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt...

Vaccine efficacy or vaccine effectiveness is the percentage reduction of disease cases in a vaccinated group of people compared to an unvaccinated group...

In the sociology of crime, the term collective efficacy refers to the ability of members of a community to control the behavior of individuals and groups...

In political science, political efficacy is the citizens' trust in their ability to change the government and belief that they can understand and influence...

The efficacy of prayer has been studied since at least 1872, generally through experiments to determine whether prayer or intercessory prayer has a measurable...

Technological self-efficacy (TSE) is "the belief in one's ability to successfully perform a technologically sophisticated new task". TSE does not highlight...

Most efforts to measure self-efficacy have focused on a subject's expectations about performing specific tasks or what is referred to as "domain-specific"...

the characteristics of COVID-19 vaccines. These characteristics include efficacy, effectiveness, and safety. As of November 2022[update], 40 vaccines are...