because general bogdan alluded to some of them just a minute ago. what are, say, the top three technical challenges? is a software? is the medal fatigue or problems, metal production? failure of that? what is it and, i'm sure all of them hadn't been satisfied but i feel technically they will. >> i will give you my three and general bogdan may speech is that important? >> it is different list of things we are attacking. the top three am i less comfortable with of all would be software. getting the software complete. it is critical to airplanes we need to get that done. we will have to make some decisions as we get further along. we are about to do a critical design review for that software and will be looking at very closely this fall. the second thing on my list is the helmet. the cockpit of your plan is designed around the concept of that helmet. the ability of the pilot to look through the structure of the airplane and have all the things he needs in front of him in the advisor of the -- in the visor of them. there are a number of issues within wo

. >> your statement will be made as part of the record general bogdan? been a distinguished members of the subcommittee thank you for the opportunity to discuss the f-35 program with you today. i will be brief. it is not the same program as it was a number of years ago we have significantly restructure the program over the past two years to create a more realistic base line and we have adequately resource the program to meet commitments in terms of manpower, a technical expertise, and many. relative to the program's schedule executed with minor delays but on track to the schedule we put in place 2010. i am confident meeting the commitments that well allow the ioc to declare in 2015 and 2016 to meet the commitments of our initial partners to deliver airplanes to them. of us are fine no capability in 2017 we can discuss that further with a q&a. affordability is my number one concern is a priority. relative to development we have taken a mindset we have no more time and and many in the development phase of the program meaning within the resources we are giv

pointed that out and they need to look at fuel costs and how they man the aircraft and i think general bogdan said with the concept of operations you have to pay a lot of attention how to fly the aircraft. >> what is your assessment of the f-35 manufacturing process? >> right now we actually to word of the process to gather data on a number of different things that indicate manufacturing like efficiency rate -- rates do deliver aircraft and in every case even in the engineering changes with the results it is trending in the improved way and to rethink it will but when it's 40 percent of the flight path to understand the flight envelope and most of those changes are behind them so we think that manufacturing process will improve. >> comparing that with others, how is it similar or not? >> the manufacturing process? >> the first thing with this one that is not unique it is the fact they have three variants going through final assembly on the same line. it is more complex and i think they have done a pretty good job of working that out. of those acquisitions the f-22 and others said is very simi