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Exercise 3.1 Model Answer
 
Task

Produce an argument map of the reasoning in this passage:

The Lunar Module did not land on the Moon. There are two reasons to believe this. First, there is no dust on the footpads of the LM. Second, there is no blast crater in the dust under the LM. [Based on 4.0-1]

Note that for this exercise your argument map need not represent any hidden co-premises.

 
Model Answer

 
Discussion

This is a multi-reason argument; it presents two separate reasons for the conclusion.

It would be incorrect to map the argument this way:

In this incorrect diagram, the premises are strange bedfellows; they don't belong together in one reason, even though they are somewhat alike in character.

Each of the reasons in this argument have hidden premises; a completed argument map would have the following form:

 

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 Last updated 28-Nov-2006