In a training session the question was asked how to change multiple parameter values in a family when there are several types already set up.  This is a tip I have been using for years and I know it has been posted many times but thought I would add my version to the topic.  The easiest way to do this is to add a value in the formula column, hit apply.  This will change the value to all types in the family, then delete the formula and you have updated all the types.