When a party uses the testimony of a witness to show proof, the opposing party often attempts to impeach the witness. This may be done using cross-examination, calling into question the witness's competence, or by attacking the character or habit of the witness. So, for example, if a witness testifies that he remembers seeing a person at 2:00 pm on a Tuesday and his habit is to be at his desk job on Tuesday, then the opposing party would try to impeach his testimony related to that event.
when a party uses the testimony of a witness to show proof the opposing party often attempts to impeach the witness this may be done using cross-examination calling into question the witness's competence or by attacking the character or habit of the witness so for example if a witness testifies that he remembers seeing a person at 200 pm on a tuesday and his habit is to be at his desk job on tuesday then the opposing party would try to impeach his testimony related to that event