From: Mel Beckman <mel@beckman.org> Sent: Wednesday, January 16, 2019 9:21 PM

MTBF can’t be used alone to predict failure probability, because product mortality follows the infamous “bathtub curve”. Products are as likely to fail early in their lives as later in their lives. MTBF as a scalar value is just an average.

Yes very good point -however that's where the historical data should come to rescue to help bend the MTBF line into this expected "bathtub curve". adam