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About concerning system change, Lehman and Belady introduce set of laws. In this “Continuing change” is one.

Law: A system that is used in a real-world environment necessarily must change or become progressively less useful in that environment.

According to this, it states that system maintenance is an inevitable process. As the system’s environment changes, new requirements emerge and the system must be modified. When the modified system is re-introduced into the environment, this promotes more environmental changes so the evolution process recycles.

If the number of users may increases, then the burden of the system requiring is expanding to its hardware capability for handle several connections.

The business model of the company may change so the system become obsolete and need for a change to cope its requirements.

The law in the particular country may impose a particular standard to conform legal usable software.

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