The system CDR is basically the overall view of the design aspects and so it has been a six-year process to get to this stage and so hundreds of engineers and scientists from around the world from the number of country institutions have participated. I was involved with ALMA and now at EZO with ELT so it's about the same scale size of complexity. Each project is different of course and it comes with different challenges. I think that that's one of the attractions for astronomers and engineers is working out how to overcome these challenges and I think they've really got the right team in place to do that. There are a lot of experts on board and people are so eager to actually make the SK the best telescope it can be. Sets of the requirements are quite challenging technically and so finding designs that can actually fulfill that performance are difficult and so we've gone through a number of different prototyping stages some of them are not successful but that's the reason you go into this. You learn a lot about the designs, their practicality and you refine that. There are lots of precursor observatories that we're benefiting from. There are other observatories around the world that are doing that are large facilities like the SKA but in terms of the overall scale of the project and its audacity in trying to address all these different facets it really is unprecedented. The SKA is going to be one of the major observatories for the future. It'll be so complimentary to the other great observatories that will be around the JWST, ALMA itself, the ELT telescopes in the optical infrared. The team has really been outstanding and I speak not only of the team here at the headquarters but also the broader team from our member institutions that were so supportive throughout. If you look at what's been achieved in the last few years it's really quite remarkable and this year in particular has been a huge push with the creation of the IGO, the design really coming to maturity. Certainly looking from the outside it's very very impressive. They've done a tremendous job of actually getting the consortia to the point where they're able to just to move forward with the actual construction. Having this milestone of the system CER is really the foundation for everything in 2020. This is the year where we have to pull together the construction proposal itself. It's just so exciting that right now it's actually all coming together to the point where it's a tangible project. It looks like a telescope now. We've gotten our wish. We get to continue to move forward on the project and it is fantastically exciting to really see this observatory beginning to come together transitioning over the next year from the analysis and documentation exercise that all the planning is intact to the actual execution and that's fantastic.