If a student has accepted a position in writing, and if other forms of University support become available to him/her at a later date (fellowships, research assistantships, etc.), then he/she may be released from his/her position only if, in the judgment of the Associate Head, a satisfactory replacement is available or if the circumstances have made it possible to maintain the teaching program without his/her services. It is the policy of the School to permit such changes when possible and when they are in the interest of the graduate student concerned; but the undergraduate teaching program must be protected.