Getting a good consultant review is often difficult; as individual consultants are often extremely specialized, they are difficult to compare. For example, one consultant may focus on human resources in tech companies. Other consultants focus on business practices like Six Sigma, a system designed to provide quality assurance in manufacturing, and there are consultants which focus on how managers spend their time. It is easier to find a consultant review for a larger company, which hires teams of consultants.

When choosing a consultant, managers should ask to see the consultant's portfolio. They may wish to call or email the companies with which the consultant has done business; if the other company's managers did not like the consultant's work, they are certain to let people know. However, getting a personal review is not always feasible, so it is a good idea for people looking for consultants to read more on this site.