Physical security course work

Write a speech that you would give to a friend in an elevator summing up the contents of this course. You have 30 – 90 seconds to inform your friend of the most important elements. Go!

Sum up the most important concept that you learned in 160 characters or less.

Textbook:  

Fennelly, Lawrence, J. Effective Physical Security, 4th Edition. Butterworth-Heinemann, Elsevier, 2012 ISBN 978-0-12-415892-4