The respondent, a medical doctor, was employed by the National Health Laboratory Service (NHLS) in January 2006 as a junior registrar under a training and employment contract. Clause 3.4 of that contract provided that, after qualifying as a specialist pathologist, she had to work for NHLS for two years or repay training costs quantified at R2 million. She completed her specialist training and, in April 2010, concluded a second employment contract with NHLS as a specialist pathologist. The second contract did not refer to the repayment/work-back obligation. Four months later, the respondent resigned. NHLS demanded repayment of R2 million in terms of clause 3.4 of the initial contract. The respondent refused, arguing that the second contract replaced the first and extinguished the repayment obligation.