we've taken care of maybe one or one and a half pages out of the 15 with provisions that are on the utm. the rest are not on the itm, and you have to figure out and average and marginal rate effects. so assuming that you've got all that the next step is to run macro models. so pick a macro model, you're going to compute the current macroeconomic baseline. you need to read in a proposed law change and then the a step i think many people sort of don't think about and are not aware of its importance is checking to see does the liability change that you're getting at this stage -- we're not even talking about running the macro effects of the policy just calculating something that rough liquor responds to -- roughly corresponds to a conventional score and then checking the models produce the same conventional score that the 15 pages of table show. and if it doesn't then you've got to do some debugging. typically, that means it rating back and fort between the individual tax model spread sheet inputs in the macro model until you've got the conventional estimate matching. so now if you're conv

i would note that i am encouraged by for example, the work that nasa has started on utm concept beyond line of site so they are starting to attack some of those problems so thank you for the opportunity. >> mr. henson, thank you for those comments. the committee is going to stand in recess till after these votes. when we return, we will go immediately to our questions. sorry for the inconvenience. i hope we're back within 30 minutes if you all to take a break until then. >> thanks. >>> the science committee will re reconvene. we will now begin our questioning and i will recognize myself for that purpose. dr. waggoner mr. williams let me direct my questions to all of you. what is a realistic deadline for integrating the drones into the national air space system. i mentioned in my opening statement that it appears that the deadline has slipped but what can drone users and even the american people the wider audience, what is realistic deadline for that integration? dr. waggoner and then mr. williams. >> so chairman i would answer that right now we do have a level of integration. so for pu

i will note i am encouraged, for example, by the work that nasa has started on utm concept beyond line of sight so they're starting to attack some of those problems. thank you for the opportunity. >> dr. hansman, thank you for the comments. the committee is going to stand in recess until after the series of three votes. when we return we'll go immediately to our questions. sorry for the inconvenience. i hope we're back within about 30 minutes if you all want to take a break until then. >> thanks. >>> so the chairman of the house science committee lamar smith of texas recessing this hearing on drones, or unmanned aircraft systems, so that members of the committee can go to the house floor and vote. the house has been debating and voting right now on a natural gas pipeline construction permits bill. a bill that would require the federal approval of such construction projects within a year. that vote now in the house and you can watch that live on our companion network c-span. on the other side of the capitol, the senate has been continuing debate on amendments to the keystone xl pipeline

i would note that i am encouraged by, for example the work that nasa has started on utm concept,on line of sight so they're starting to attack those problems. thank you for the opportunity. >> dr., thank you for the comments. the committee is going stand in recess until after the votes, and when we return we'll go immediately to our questions. sorry for the inconvenience. hoe we're back within 30 minutes if you want to take a break until then. >> we now reconvene. let me direct my first question to you al which is this what is a realistic deadline for integrating the drones into the national air space system? i mention my opening statement that appears the deadline has slipped, but what can drone users and even the american people, the wider audience -- what is a realistic deadline for that integration? dr. wagner and then mr. williams. >> chairman, i would answer that right now we do have a level of integration. so as -- for public aircraft they're flying every day. we're -- nasa does research but year also user ands have unmanned aircraft. civil applications, we're working very closel