Hanover has an elaborate application process that weeds out anyone who doesn't really want to work there. The process begins with an online application, then personality and IQ tests, a practice essay, then a phone interview, then in-person interviews (3 interviews over around 2 hours), and finally a job offer. Frankly, if you aren't serious about working for Hanover, the process is tedious and time consuming.
Step 1: Submit an online application. Inside references help, but will not get you a job on their own.
Step 2: Personality and IQ tests. These don't matter that much, you just need to complete them.
Step 3: Initial phone interview. Just be truthful and talk about your past research experiences. Hanover is a methodologically driven company. We want to know about the thought process you used to create an original, sound methodology for previous work.
Step 4: Sample report/essay. You will receive an essay prompt. Write a concise report to the best of your abilities using the best sources you can find. No specific format is required but organization matters. Information should be presented logically and effectively. If you receive an essay prompt, you have to write an essay to continue in the interview process.
Step 5: In-person interviews. If Hanover likes your essay, they will invite you into the office for in-person interviews. Typically you interview with two content directors (research managers) and someone from HR. The content directors determine if you are a methodologically driven researcher who writes well and fits Hanover's culture. Be truthful. If you are not a fit for this company, you will not be happy here.
Step 6: Job offer. Hanover does not hire impulsively. If you don't get an immediate job offer, be sure to keep in touch with your contacts and periodically remind them you are still want to work for Hanover.