Free GMAT Test Questions

The skills required for a particular job role often change with the changing business environment. In the past, the chief skill that businesses sought in their clerks was the ability to do mathematical calculations fast and accurately since a slight clerical error could result in a huge financial loss for the business. However, as businesses have become increasingly computerized, the primary skill they now look for in clerical candidates is proficiency with bookkeeping software.

In the argument above, the portion in boldface plays which of the following roles?