Answered by Steve, Hiring Expert at Caterpillar Inc., on Friday, January 8, 2016
It is understandable to be frustrated in this situation, but be patient and be persistent. It often happens that a hiring manager has other priorities thrust upon them and filling their open positions becomes secondary. In this case, be diligent, but not overwhelming in your follow-up. Vary the ways in which you follow-up with them. Reach out via e-mail first. If you do not get a response, reach back out after a couple a weeks by phone. Always be polite and understanding in your inquiries (i.e. "I know that you are very busy, but I am excited about this opportunity, so I just wanted to follow-up to see where you stand."). Always make it clear that you have a high level of interest in the company and the position. Also, refer back to the company's careers site. Many sites give the candidate the ability to see, at a high level, their status in the process. Most hiring managers start out with the intention of filling their positions quickly, but other factors sometimes make this difficult. Keep following up in a professional manner and you will receive closure to the situation soon.