Hey Robert!
Here's your checklist for writing an SOP for the Cornell University:
Described your academic background in enough detail to show your experience and preparedness in the field? Shown that you are a good fit for the program you are applying to? Defined why you want a graduate degree in this field? Demonstrated that you are self-motivated, persistent, competent, and have the skills necessary to be successful in graduate school? Followed the ASOP instructions as defined by the program you are applying to? Polished, proofread, and had others review your ASOP?