Answered by Steve, Hiring Expert at Caterpillar Inc., on Friday, November 8, 2013
I think that you are fine to follow-up via e-mail at this time. In that e-mail, be both casual in your inquiry (i.e. 'I was just curious about my status'), but direct in describing your level of interest in the position (i.e. Please let me reiterate my strong level of interest in this position). If after several more days, they have still not responded, then it would be appropriate to follow-up with a phone call. It is important though, not to be overly agressive in your follow-up. Respect the fact that the hiring managers are very busy and other priorities can take prescedent over hiring decisions. A professional approach to follow-up can be effective on two fronts - it can demonstrate your high level of interest in the company and job and show the level of professionalism in your written and verbal communication skills.