english: Groves and Kahn (1979) offer a peek inside the transition from the first to the second era in survey research by doing a detailed head-to-head comparison between a face-to-face and telephone survey. (???) look back at the historical development of random-digit-dialing sampling methods.
non_english: Groves and Kahn (1979) nyedhiyakake pamindhahan ing transisi saka periode kapindho nganti kaping pindho ing panlitam survey kanthi nglakoni perbandingan sing luwih rinci antarane survey pasuryan lan telpon. ( ??? ) katon maneh ing pangembangan sajarah metode ngambakake acak-digit-dialing.