If you like their portfolio, you can trust their judgement of your tools. It's easier for an outside consultant to see a company through fresh eyes. Once you have established your assessment criteria, it is time to rate each communication element accordingly. Whether formal or informal, in the end you should arrive at a clearer understanding of what is working and what isn't, simply by doing some critical thinking. Develop a list of key questions that apply to every communication tool or activity.
Many businesses measure the success of communication activities by their immediate impact on sales.
Look at what kind of waves your communications are making. Look to the competition. Take your unique selling position and see if it stands above the rest. Bring in as many people as you can to help you evaluate your material. Have them call in and listen to you answer the phone.