A error was made in typing a patient (no bb computer system). First tech had done Type & Screen. Reactions of ABO were written down correctly, but interpretation was not (Patient was B neg, type interp. as A neg). Following tech repeated type when doing the IS xmatch. Type interp. erorr was repeated by 2nd tech (next line on log sheet). IS xmatch apparently was not done, or not interpreted correctly. Patient was transfused. This was a small lab, tech was working alone (also w/o a phleb, because someone had called in sick). They have been working for over 20 years without significant errors. Would you fire them?