Training implementation methods​

Parallel

When the new system is used at the same time as the old system the two systems are said to be running in parallel.

Advantages:

Users can can compare the output of the old system with the output of the new system, to ensure correctness

There is little risk of data loss because the known-good system is running

Disadvantages:

Users must take more time to enter data into two different systems

Data could be different in two different systems if there is intensive data entry.

Phased

When small parts of the new system gradually replace small parts of the old system, the implementation method is said to be phased.

Advantages:

Training can be completed in small parts

A failure of the new system has minimal impact because it is only one small part

Issues around scale can be addressed without major impact.

Disadvantages:

This implementation method takes more time to get the new system fully online than other methods.

There is a possibility of data loss if part of the new system fails.

Pilot

When a small group of users within an organization uses a new system prior to wider use, the system is said to be piloted.

Advantages:

Training can be supported by pilot group

Failure or problems can be identified and addressed without wide-spread impact to the organization

Disadvantages:

In a pilot, issues of scale can cause problems. For example, the system might work well for 10 users, but not for 1000.

Direct

When a new system is implemented without any phased or pilot implementation, it is said to be direct. The old system is retired, and the new system goes live.

Advantages:

If the system is not critical, this can be a good method for implementation

Disadvantages:

If you are not sure the system will work, this method of implementation may not be a good idea

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answermarginal cost;