Maintenance

• Just like any other software system, CBR systems need to be maintained.
• The addition of new cases is an obvious way to improve the system.
• However, care is needed that the underlying cases are not changed over time.
• A loan from 1900 is really quite different than one from 2000.
• Additionally, changing the similarity metric may also vastly change the performance of the system.
• Bad results can be fixed by modifying the similarity metric or modifying the case base.
• What happens if the case base has a bad answer in it? There is no reason that it cannot be removed.
• Another important technique is to keep a series of tests around. These are separate from the case base but can be used to test the performance of the system.