> but I've worked on a complex re-implementation of a dynamic language and supporting libraries on the JVM which involved a lot of quite complex problems and va

> but I've worked on a complex re-implementation of a dynamic language and supporting libraries on the JVM which involved a lot of quite complex problems and various agile techniques served us extremely well. Any specifics? I would have imagined this to be a case with very strict up front requirements with a relatively heavy toll on changing the design during the project.