My employer has told me that any changes to my duties will be assessed by job evaluation. What does this mean?

Job evaluation is a system of grading different jobs so that they can be compared and evaluated.

Although there are different job evaluation systems, the outcome for each type is a grading structure based on the comparative values of the different jobs in the organization.

It is the jobs which are evaluated not the job holders.

If your employer intends to re-evaluate your job, because of a change in duties the outcome may be a regrading of your job.

Good job evaluation schemes should involve employee representatives and should provide for an appeal.