All- In the past week, we have received several e-mails expressing interest in the NPTS Add-On program. Many of you have asked us for a cost estimate. Because the next NPTS has not been designed, nor has contractor(s) selection been made, we cannot quote a price for add-on samples. However, we can give you some "guesses." Here is a list of common questions we've received so far, along with answers from Susan Liss (FHWA), and the rest of the NPTS team. 1. What did it cost in the past? For the 2001 survey, the cost of an Add-on sample was $165 per completed household. 2. When will we know more about costs? FHWA has let a Request For Information (RFI) to get projected costs for the next survey (using the 2001 survey content and approach as a strawman). The RFI was let on 6/24 and responses are due on 7/24. We expect to contact RFI responders during the month of August to work out questions and suggestions. We plan to have a much better estimate of survey costs by Labor Day. The Request for Information, posted at: <http://www2.eps.gov/spg/DOT/FHWA> Go to Office of Acquisition Management, Washington DC, click on Posted Dates, then click on Previous Days, then go to June 24th and click on "Request for Information for Costs of Conducting the NPTS 01". 3. Why would the costs change from the 2001 survey? 4. For planning purposes, what number should I use now? I would use $175 per completed household. BUT, recognize this is my best guess-timate. It is not an actual cost estimate. 5. Is it possible that the costs will be less than the $165 per household that the add-ons paid in the 2001 survey? Yes, it is possible. One of the reasons we let the Request For Information was to see if we could offer the add-on samples at a lower cost. 6. What if the next NPTS has different content and methods than the survey described in the Request for Information? We will need to bear that in mind and make appropriate adjustments as we plan the next survey. However, we also plan to have enough Add-ons so that a survey very similar to the 2001 could be conducted for you, based on the cost estimates we receive from the RFI. There is certain core content to a household travel survey that will not change. 7. Is there a minimum sample size? In the three survey years that add-ons have been conducted (1990, 1995 and 2001), we have suggested that a minimum sample of 1000 households be conducted for an add-on jurisdiction. 8. How can I calculate the appropriate sample size for my jurisdiction? Appropriate sample size depends on the size of your area, the questions you want answered by the survey and the degree of statistical validity you need. Nancy McGuckin of the NPTS Team can help you get a better idea of an appropriate sample size. Once the survey research firm(s) have been selected for the next NPTS, their sampling statisticians can work with you on sample size and other sample needs. (No, they don't try to sell you more samples--- my experience has been that they are annoyingly scientific about the process.) 9. How can I give my input for the next NPTS survey? There are several ways - . Respond to the RFI (see above) - comments and input on all aspects of the next NPTS are being solicited, in addition to the cost estimates . Visit to the Community of Practice website for NPTS, where we are establishing a communications channel with our potential add-ons, other data users and other survey stakeholders. Go to <http://knowledge.fhwa.dot.gov/cops/hcx.nsf/home> Scroll to the bottom, and click on "Household Travel Data Program" . Call or email one of the NPTS Team members NPTS Team Susan Liss, Project Manager, 202-366-5060, susan.liss(a)fhwa.dot.gov Nancy McGuckin, Travel Behavior Analyst, 202-366-8750 nancy.mcguckin(a)fhwa.dot.gov (works on NPTS Tues, Wed afternoon & Thurs.) Nanda Srinivasan, Travel Data Analyst, User Support & GIS, 202-366-5021 nanda.srinivasan(a)fhwa.dot.gov (yes, this is the same Nanda Srinivasan that also works on CTPP) Yuki Nakamoto, SAS Programmer, 202-366-6958 yuki.nakamoto(a)fhwa.dot.gov (works on NPTS on Tues & Thurs) Thank you for your interest in the NPTS Add-on Program. Those of us on the NPTS Team believe the Add-on component is a useful, tested, comprehensive way of obtaining a household travel dataset for your area.