How has the concept of aviation safety changed over the past century? What’s so different between our standard, established safety program and this so-called SMS?

Used the attached document to answer the following questions.

How has the concept of aviation safety changed over the past century?

What’s so different between our standard, established safety program and this so-called SMS?

Fill me in so I can justify the expense of this SMS deal.

How would this so-called safety management idea improve our current good safety record?