In a non-union environment, most employers who are genuinely interested in creating equity within their organization completely--that's pay equity throughout their organization--will typically engage in some form of job evaluation process whereby the jobs are evaluated against one another, and then they try to apply some scientific process to make sure pay is established at various levels of the organization, which recognizes the skill, responsibility, and working conditions of the job.
On May 28th, 2009. See this statement in context.