两术语均用于指对疑犯进行的一种指认行为。区别在于lineup (也称为line-up identification)为“列队辨认”，是让犯罪嫌疑人与其他人一起列队后一个挨一个地让证人（或受害人）进行辨认(a line of persons assembled by police for possible identification of a suspect by a witness to a crime)[1]。而 show-up 为“当面指认”，它没有lineup正式，是当情况不容许列队辨认时所采 取的一种替代方式，一般让犯罪嫌疑人单独与证人（或受害人） 进行面对面的辨认(one-to-one confrontation between suspect and witness to crime 或 a presentation of a criminal defendant or a arrestee individually to a witness for identification)[2]，要想此种方式辨认所得的证据为法院所采信，该程序必须遵守正当法律程序（due process)才行。

[1] Cf. Linda Picard Wood, J. D. , Merriam Webster's Dictionary of Law，at p. 297， Merriam-Webster, Incorporated (1996).

[2] Cf. The Publisher's Editorial Staff, Black's Law Dictionary, abridged 6th edition, at p. 962，West Publishing Co. (1991 ).