The employment-at-will rule may be found invalid in situations governed by an implied contract. An implied contract is an inferred understanding of the conditions of continued employment. The employer's assurances, either written or oral, of continued employment could void the at-will arrangement and require the employer to show just cause in a discharge. Specific statements by a supervisor such as "You will have a job here as long as you continue to do good work" have been found by courts to constitute an implied contract. Kelly v. Georgia-Pacific Corp(1989) provides a definition that is useful: "The court can consider the character of the employment, custom, the course of dealing between the parties, company policy, or any other fact which may illuminate... circumstances that may alter "at-will' employment.