Repairing Arguments

If we find an argument that is either weak or invalid, we can repair it following some easy steps.  One way is to add an unstated premise or unstated conclusion.  By doing this, we can make the argument stronger or more valid, and according to the text, by accomplishing this will repair your argument.  Take the example argument:
Recycling is important.  Everyone should recycle.
The premise here is "recycling is important." and the conclusion is "everyone should recycle."  This argument is weak as of now because we are being too vague with our premises.  We need to add one or two more to make this argument stronger.  By adding the premise: Recycling helps save the rain forest from being cut down and cuts down on the amount of pollutants in our air.  Supposing that the person we are arguing with knows background information about this topic, we can safely assume these premise.
The argument is now:

Recycling is important. Recycling helps save the rain forest from being cut down and cuts down on the amount of pollutants in our air. Everyone should recycle.

By adding this one premise, we give reason for people accepting our first premise to support the conclusion.  By just telling someone that something is important is not enough.  By adding this premise however, we can show how recycling is actually beneficial and important.  This argument is now stronger and more valid.  Also, the premises are plausible and seem more plausible to the person who with we are arguing.  By satisfying these, we are following the guide to repairing arguments.