In hiring desicions employers rank communication skills the highest?

In hiring desicions employers rank communication skills the highest?
I assume what you meant to ask was, "Do employers rank communication skills the highest in hiring decisions?" Properly spelling "decisions" would help, also.
Communication is absolutely important. Most firms won't hire you unless they know you can communicate effectively. What good is any skill if you can't communicate your message to a target audience? That goes for any field in any industry. For example, you can be a brilliant financial analyst, but if you can't communicate your ideas, you are useless to the organization.
As part of the recruiting process, many firms are beginning to test a prospect's ability to communicate. Obviously, oral communication can be gauged through face-to-face interviews. To gauge written skills, a recruiter will email you a case. You have 1-2 hours to read the case, write a properly formatted one-page memo on some aspect of the topic, and email it back to the recruiter.
Recruiters say that this is an excellent way to drastically reduce the size of the applicant pool under consideration. This method is becoming more and more common in the interviewing process because it represents an activity you will use on a daily basis in your career.