"4.1. Earnings will be directly related to a measured work performance index locally agreed and calculated weekly, but stabilised by averaging four weeks and monitored in accordance with paragraphs 3.8. to 3.10."
"5. ...It is not at all surprising that he and other employees are aggrieved that they are, in real terms, being paid substantially less for their work, in 1997, than they were in 1992."