This is for a Physics PhD program. I received my BSc in Physics.

An effective outline for your statement of purpose might look something like this:

1. INTRODUCTION
   1. An attention-grabbing hook
   2. A brief introduction of yourself and your background as it relates to your motivation behind applying to graduate school (I skipped eleventh grade, went to university and graduated a semester early with 3.0 GPA in physics at 20 years old).
2. BODY
   1. Your relevant experience and accomplishments that relate to the field
      1. Example 1- Member of Women in Physics
      2. Example 2- No grade lower than a 'B' in physics
      3. Example 3- I want to help with technology version of physics in healthcare or go into astronomy or meteorology. This is a flexible degree.
   2. Your professional goals as they relate to the program you're applying to-I want to get into medical physics or nuclear physics.
   3. Why you're interested in the specific school and what you can bring to the table-I want to earn a degree so I can work towards my personal goal of helping HIV/AIDS and cancer patients in my free time.
3. CONCLUSION
   1. A brief summary of the information presented in the body that emphasizes your qualifications and compatibility with the school