1. Challenges CPU performance Variable density Multi-thread computing
New architecture of PC – many core processors
Geant4 will require revisions
Biasing technique
There are some good results
Need further development

2. How to Proceed with Low-Energy?
It is useful to plan a separate migration for following parts of the Low-Energy software:
Data structure
Livermore models
Penelope models
De-excitation module
DNA models (???)
Testing should be well established
Old code unchanged – only urgent bug fixes should be introduced