> 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.
Having said that the team should be the ones driving this sort of thing - we switched between scrum and kanban several times depend on the nature of the work, and we kept looking at what we were doing to see if it was helping us, and when it wasn't we stopped doing it or changed it.