Information systems implementation simply means the deployment of a new system to replace the old.  In the past, it involves phasing out manual operations in the business process and migrating to computerization and automation of the business process. 

Today however, when almost all companies and businesses have their own information systems architecture, implementation could mean any system upgrade or a migration to newly acquired information systems architecture.

There are two methods that companies can use when implementing new information systems.  The first is direct implementation approach.  Direct method of information systems implementation involves complete abandonment of the old system in favor of the new technology. 

This has some advantages and disadvantages.  When companies use direct implementation, they usually set a time for cut off from the old system and transferring their operations to the new.  This saves time, effort, and money.  It involves little capital overhead except for the acquisition of new systems and training of staff. 

The marked disadvantage is system shock.  Employees might get confused with the new system and abrupt change could immobilize them.  Company productivity will suffer significantly.  This can be overcome easily through adequate preparation.

The second method is parallel implementation.  This is a more conservative approach of migration to other systems technologies.  It involves running two separate systems at the same time. 

The old information system will be gradually phased out while the new one will get increasing rate of usage.  The advantage of this method is it does not create much dislocation or systems confusion. 

The disadvantage is it takes time for change to take place and the company may be running redundant work applications due to parallel implementation methods.

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