Asking experts their opinion is an important methodology in those settings where the major issues have not been previously addressed, often early in the topic's research life cycle. Heterogeneous expert opinion (HEO) refers to gathering the opinion of experts that derive from a number of categories, e.g., partner, manager, and senior, or whether they are accountants or computer scientists. They are heterogeneous in that they are recognized as having different levels and/or types of expertise. Research of enterprise resource planning (ERP) systems must carefully examine expert opinion and determine when using HEO is appropriate and when it should be stratified. In addition, where possible, previous research needs to supplement or be compared to the HEO to determine similarities and differences with other groups.

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