Social psychologists have developed several theories for explaining the ways in which the psychology of a crowd differs from and interacts with that of the individuals within it. Major theorists in crowd psychology include Gustave Le Bon, Gabriel Tarde, Sigmund Freud, and Steve Reicher.
KPIs, or key performance indicators, are measures too. But generally, KPIs are the most important measures for a business or organisation, usually having the highest leverage to impact its success. Due to their catchy name, the term KPI has almost become synonymous with the term performance measure.
Unsourced material may be challenged and removed. (October 2014) (Learn how and when to remove this template message) A performance indicator or key performance indicator (KPI) is a type of performance measurement. KPIs evaluate the success of an organization or of a particular activity in which it engages.