9.2 Legacy systems
Large companies started computerizing their operations in the 1960s, so for the past 50 years or so, more and more software systems have been introduced. Many of these systems have been replaced (sometimes several times) as the business has changed and evolved. However, a lot of old systems are still in use and play a critical part in the running of the business. These older software systems are sometimes called legacy systems.
Legacy systems are older systems that rely on languages and technology that are no longer used for new systems development. Typically, they have been maintained over a long period, and their structure may have been degraded by the changes that have been made. Legacy software may be dependent on older ...
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