The process by which some workers continue to be covered by older contract language, while new contract changes are applied only to new workers. The workers who are exempted from specific changes in the contract are "grandfathered in." For example, a new wage structure may apply only to new workers, while current workers continue to be paid as they had been under the previous contract. For example, in the 1999 contract campaign, the university proposed a change in pay structure that would have cut the pay of some TAs. The university proposed to "grandfather in" these TAs, so that only future TAs would be affected by the pay cuts. (We didn't accept the changes, by the way.)