Unless there is some cogent reason for departing from this rule, the usual method, after the witness has been sworn and his competency determined, is for the party offering him to interrogate him in what is called his direct examination, or examination-in-chief, as it is sometimes styled. He is then turned over to the opposing party for cross-examination. The scope of the cross-examination is usually limited to the matters brought out in his direct examination, or to matters inseparably connected therewith. On all new facts elicited on cross-examination, he may be interrogated by the party adducing him, in what is termed "redirect examination." Then he may again be questioned on all matters brought out on re-direct examination by the opposite party in what is styled "re-cross-examination." In practice, an important witness seldom leaves the stand until he has passed through several further stages of successive examination. Beyond the re-cross-examination, the alternate stages of questioning are not usually given any special name. Leading questions cannot be asked one's own witness nor questions calling for a conclusion of any witness except an expert.