2. What is engineering? ``It is the systematic application of
scientific knowledge to the betterment
of the human condition.’’
(unidentified man at Burnaby bus stop)

3. The Harm that Engineers Do
Category 1: Unexpected, unintentional harm.
Example: the Therac 25

4. The Harm that Engineers Do
Category 1: Unexpected, unintentional harm.
Example: the DC-10

6. Rear cargo hold door secured from outside
If door opens, hold depressurises
Pressure differential collapses floor
Control lines ruptured

8. The Harm that Engineers Do
Category 1: Unexpected, unintentional harm.
Example: Virginia Power and Electric

11. Solution to Category 1 Problems:
``Engineers must insist on 100% safety, no matter what the cost.’’