Hi!
First I'd like to understand your query better. You would like to understand 1-5 point rating of Communication Skills for the purpose of interviewing candidates for your organization?
If that's the case:
1. We need to understand what is meant by Communication Skills in detail. By itself it is too vast; its beyond the simplistic notion of speaking-listening-body language.
2. Different positions (or job profiles) require different aspects of Communication Skills. For eg, the communication skills required for a tele-caller are totally different from that for a software technician or a receptionist, etc. Also higher the postion in the organizational hierarchy, the more complex the requirements for Communication skills. For eg, between an entry level position versus a team leader; or a Vice President or CEO.
3. List down and then rate the areas of Communication Skills required for that position. Possible competencies could be- effective speaking, active listening, empathy, body language- eye contact, voice- pitch/modulation/tone/inflections, gestures, postures, use of silence etc,; persuasion, negotiation, ability to handle difficult customers, ability to say "no", ability to disagree without negative aggression, use of assertiveness, ability to handle ambiguity/ask and answer questions/clarify doubts/ explain point of view; logical reasoning/analytical ability; communicate bad or unpleasant news...
The list is exhaustive; it depends on the position and its criticality in the organization.
4. Once the parameters are clearly defined; only then can the rating be given; whether its on a 5 point scale or otherwise. I would advise that all these issues are carefully thought out and discussed, before ratings are finalised. Also equally important is that all the interviewers (or assessors) in your organization must then be trained to understand and implement that rating on a consistent basis. Otherwise the effort is useless and a good candidate can be missed; or a bad one may get in.
5. There is no set standard or benchmark for a 5-point rating on Communication skills. It varies depending on the business needs.
Hope this has helped a bit.
Have a great day!
Suchitra