Compare and contrast vertical and horizontal integration.  What are some of the variables make each of these integrations valuable?

This DB has three parts:

1.  Compare and contrast vertical and horizontal integration.  What are some of the variables make each of these integrations valuable? Provide an example of a vertical and a horizontal integration that has happened recently.
2.  In what circumstances should an organization consider diversification as a viable strategy?
3.  What benefit does a global strategy provide an organization? Describe a situation when a global strategy would not be a viable solution for an organization.