He knows the best practice in the business. He is also aware of the best practice in the business because of his relationship with many other organizations and businesses. His knowledge of how to get things done from diverse perspectives is what makes him an expert. The exposure to a lot of organizations allows this expert to efficiently weigh what can and cannot work for a business. More often than not, this business consultant professional already has a standard methodology for working with business problems and issues. Recommendations are commonly based on these methodologies so he can effectively plan as well as help implement changes in the organization or business.
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