Customer by customer

Problem/Context

In a Replacement project where the existing system is based around customer accounts.

Solution

Develop just enough features to be able to migrate a small number of customers of one type. After that customers are migrated in increments.

Strengths

• If there is a large variation in features that are needed for different types of customer this pattern reduces MDE significantly

Weaknesses

• This pattern does not work well if a customer of one type suddenly can change into another type.

Examples

• Banking systems
• Insurance systems