Conversational speech related problems Partial words and restarts ... yeah you n[eed]- you n[eed]- I think you need ... Laughter words yeah [laughter-well] [laughter-he's] [laughter-he's] [laughter-he] he's not bad .... Mispronounced words ... I played chicert[os]- uh concertos .... Telephone channel related problems Acoustic echo Static noise, clicks, pops etc. About 8% error rate in transcriptions