Does recruiting season have you just a little stressed out? Take some advice from Laszlo Bock, former SVP of People Operations at Google. Work on fine-tuning "the most controllable element of a job search: your resume."
We all know the major resume essential: active verbs. Use them well and use them often. In his article "My Personal Formula for a Winning Résumé" (read the whole thing here), Bock takes the active verb best practice one step further, and gives us a formula for each bullet point on our resume:
Accomplished [X] as measured by [Y] by doing [Z]
Neither Bock nor I are suggesting that you copy and paste this formula into your resume 15 times and only change the variables within the brackets. What will make your resume (and subsequently you) stand out is quantifying your accomplishments.
Yes, your resume must not be longer than one page. But short and concise doesn't have to mean vague and nondescript. Spend some time reflecting on the experiences you highlight on your resume. Learning how to concisely quantify your accomplishments will not only give a recruiter a more complete picture of who you are, it will make you feel more confident in what you bring to the table as a candidate. Not to mention, deeper reflection on your experiences will help you construct well-rounded answers to behavioral interview questions: a component to the internship search that is at least partially in your control.
Following all of the tried and true resume tips makes your resume good. Quantifying your accomplishments will make it great.
See Bock's article for how to quantify many common resume accomplishments. I've already bookmarked it for reference the next time I update my resume.