The companies that are the prime purchasers of computer software will not buy a software package if the costs of training staff to use it are high, and we know that it is expensive to teach people a software package that demands the memorization of unfamiliar commands.
Conclusion (as a result)
To be successful, commercial computer software cannot require users to memorize unfamiliar commands.
Evidence
The prime purchases of computer software won't buy a software package if the costs of training staff to use it are high, and the costs of training will be high if the software demands the memorization of unfamiliar commands.
Evaluate
On Sufficient Assumption, if the conclusion introduces a new, undefined term (like Successful in this example), we know it has to be in the correct answer.
Specifically, we need our answer to say, "Success requires ___ ", or "you can't be successful without ____ ", or something equivalent.
Given that this argument has conditional logic (if, require) and that it has repeating ideas (memorize unfamiliar commands, training is expensive), it makes sense to diagram this out if we didn't already perceive the missing ingredient as we read the argument.
Let's write the Conclusion with an elongated arrow, to represent the logic path we'll be building by combining the Premises with the correct answer.
Conclusion
Successful ---------------------------> doesn't comp soft req mem new comm's Or alternatively requires won't memorize ---------------------------> be new comm's successful
The second formation seems more useful, because the evidence allows us to build on to "if it requires memorizing new commands"
EVIDENCE
requires costly prime mem → to → purchasers new train won't buy comm's
To complete the logic path the Conclusion is trying to build, it looks like we're missing that last link of prime won't purchasers → be won't buy successful
If we wanted to avoid conditional logic, we could just ask ourselves, .
This is often good enough to get to the correct answer. However, many times there will be an answer with the two ideas that should be linked, but the answer writes the link in Reversed or Negated style so it doesn't actually work.
Goal
The two things we know about software that makes you memorize unfamiliar commands are that 1. it's expensive to teach people to use it 2. the companies that are the prime purchasers won't buy it
So a correct answer will either have to say, , or it will (more likely) say, .