---- Information System Features notes of soft knowledge test
Features information system
(1) purpose. The definition of a system, consisting of a system or an abstract system, both have a clear goal or purpose , goal decided the function of the system.
(2) can be nested property. The system may comprise between several subsystems, the system can be coupled to a larger system. In other words, the system components may also be the system. This feature facilitates the system stratification, division management, research or construction.
(3) Stability. Stability of the system means: bound by the rules of the internal structure and order system should be predictable; finite-state system and the evolution path and can be predicted; the consequences functions of the system can also play a role in leading to estimated. Strong stability of the system while making the system subjected to external action, internal structure and able to maintain the order.
(4) open. Openness of the system refers to the system of accessibility . The system determines the characteristics of the external environment can be identified, the external environment may affect the system or other system functions according to a predetermined method, using the system or behavior. Open system embodying the system may be described clearly and accurately identify other have, appreciated that a so-called on the interface level.
(5) vulnerability. The stability properties of the system corresponding to that system, there may be a characteristic loss of structure and function of the order, this feature is often difficult to be perceived by the outside world to hide. System vulnerability of poor, once penetrated, the integrity will be damaged or even collapse, the collapse of the system.
(6) robustness. When the system is faced with interference, input error factors, invasion, non-state systems may appear top of the loss of the original function, an error occurs even show damage function. The system has to withstand unexpected emergence of state called the characteristics of robustness, also called robustness (robustness), with high availability requirements of information systems, will take redundancy, fault-tolerant technology, identification technology, reliability technology the system appears to protect against unexpected state, to maintain the stability of the system.
Soft knowledge test notes
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