Before revision: It is defined as the ratio of the number of instances/ records in the system (mostly implemented as a database ) that represent real world entities and the number of entities that exist (in the real world) and should be represented in the information system according to its purpose.
After revision: It is defined as the ratio of the number of instances/ records in the system (mostly implemented as a Database ) that represent real world entitiesInstance_(computer_science)Record_(computer_science) and the number of entities that exist (in the real world) and should be represented in the information system according to its purpose.