What Is A Legacy System?

Written by Caitlin Davidson

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Legacy System Defined

A legacy system is an information system that is based on outdated technologies, but is  still critical to day-to-day operations. This type of system meets the needs that it was originally designed for but doesn’t allow for updates, growth or interaction with new systems. Simply, what the current role that a legacy systems plays for a company, is the only role it will ever play.

Company’s continue to use legacy systems due to:

  • Investment – maintaining a legacy system is expensive over time however, upgrading to a new system requires an up-front investment.
  • Difficulty – The legacy software may be built with an obsolete programming language that makes it hard to find personnel with the skills to make the migration.

To get the most out a legacy system, a few details need to be confirmed, including;

  1. Ensuring that a business needs the legacy system
  2. Determining what level of integration the business
  3. Ensure that the data is clean
  4. Monitoring for systems overlaps

In Data Defined, we help make the complex world of data more accessible by explaining some of the most complex aspects of the field.

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