Nancy Leveson, Sept 1999 Four Primary Design Principles(2 3. Simplicity Emphasis on software that is clear, simple, and therefore easy to check, understand, and modify 4. Restricted visibility Locality of informationc Copyright Nancy Leveson, Sept. 1999 Four Primary Design Principles (2) 3. Simplicity Emphasis on software that is clear, simple, and therefore easy to check, understand, and modify. 4. Restricted visibility Locality of information �