HI Manian, Cost of interview refers to cost incured behind one successful interview, this includes the infrastructure cost, cost towards calling and non availability of respondant, remuneration paid to interivewer for the complete 8 hours shift. Cost per interview is not exactly equal to cost per successful interview, there is a cost towards unsuccessful interview. Let me explain the process of interivew, the list is provided to callers in excel format, caller serially calls each number, if the number is picked and the person required is available the person is explained the purpose of study and the on his willingness the interview is conducted, the interivew is punched in CATI software. If the required person is not available caller asks as when he will be available and schedules appointement, sometimes it just becomes a cold call as no one picks up the phone. Laekage in system means - 1. Manpower is not used properly, would like to know better system to use manpower optimum. 2. The cost goes high in calling as telephone call rates are different for landlines, mobiles, std etc. 3. The data provided by client is not good enough as lot of time goes in calling and get correct repondant, we want to interview men, but instaed of cell numbers landline numbers are given, where my productivity becomes down per day.etc 4. There is lack of system to monitor are callers been utilised effectively in a day. As far as questionare matters, it is structured questionare, where interviewer has to click the responses and insome case where any openhanded feedback, interviewer has to key in the same. The calling is done by local MTNL landlines. Hope this clarifies your queries. regards RAjiv