The role of information in decision making cannot be overemphasized. Effective decision
making demands accurate, timely and relevant information. MIS provides accurate and timely
information necessary to facilitate the decision-making process and enable the organizations
planning, control, and operational functions to be carried out effectively. MIS also plays the crucial role of providing a wide range of streamlined options from which decision-makers are able to make
their preferred choices and this ensures that whatever choices are made by decision makers, the
outcome, more often than not, becomes positive. This, as a matter of fact, is the reason why many
decision makers tend to prefer using MIS tools when making tough business choices. MIS as
renowned concept, having good decision choices guarantees viable decisions in our businesses. From
the above discussion we can say that decision support system focus on decision making whereas
management information system (MIS) focus on information. In Management information system it
works on online mode but in decision support system it works on real time mode. The management
support system supports medium level of data but in decision support system it supports huge
volume of data. The management support system uses low supports of graphics but in decision
support system it uses large support of graphics. The management information system focus only on
fully structured task or routine for decision but decision support system focuses on structure as well
as semi-structured data. Beside the above differences both MIS and DSS are core of an information
system satisfying the requirement of different levels of management.