Beliefs and attitudes that are formed in people's minds over time become causal factors in behaviour and affect how people respond to security issues and events. Some of these beliefs are initiated by leaders and are developed through experience. When shared and embraced within an organization, they become common to all personnel. The beliefs and attitudes held by individuals are influenced by the actions that others take or do not take and also by what others (particularly top managers) say or do not say. In this way, beliefs and attitudes spread and replicate themselves within organizations.