If there is high level of coupling within a system it will be difficult to contain the rewrite to a single subsystem. In this case, it may make sense to rewrite

If there is high level of coupling within a system it will be difficult to contain the rewrite to a single subsystem. In this case, it may make sense to rewrite. Alternatively, you can gradually remove unnecessary coupling before applying the strangler pattern, but this can be a longer path. The related principle here is to ensure you have good boundaries in your application with minimal dependencies between each system so it's easy to rewrite portions of your app. Here is a talk on this: https://vimeo.com/108441214 https://vimeo.com/108441214