The binding legal principles established are: (1) When interpreting employment contracts and terms and conditions, courts must apply purposive, contextual interpretation that gives functional meaning to all words and avoids rendering any provision superfluous (applying Endumeni). (2) The phrase 'individual contracts of employment' in a savings clause refers to specific, express contractual terms contained in documents extraneous to general terms and conditions, not to all employment contracts that may incorporate general policies. (3) Where an employee's letter of employment is silent on a particular term (such as retirement age) and does not expressly provide for a specific entitlement, that term is governed by the employer's applicable general terms and conditions as amended from time to time. (4) An employer does not act unilaterally when amending terms and conditions if it undertakes extensive consultation processes, provides employees opportunities to object, and obtains necessary ministerial or regulatory approvals. (5) An employee's silence and failure to object during consultation processes regarding changes to terms and conditions may constitute acquiescence to those changes, particularly where the employee would ordinarily be expected to object if disagreeing. (6) Where an employment contract provides for termination on notice, an employer is entitled to exercise that contractual right, and courts will not readily grant specific performance (reinstatement) in such circumstances.