State Educational Law and Chancellor's Regulation A-655 require an annual assessment of the principal to be submitted to the Superintendent by SLT members.The form assesses the degree an effective shared decision making relationship was established with the SLT by the principal.You can read about this requirement in Section II.,B2, of Chancellor's Regulation A-655 (see link on page).There is a sample evaluation form in Appendix 3 of A-655.
In addition,you do not have to sign the CEP if you feel there was not a shared decision making process. You can attach your reason for not signing to the CEP.
Take your responsibilities seriously. Do not sign a CEP if there was no shared decision making in its development and alignment of the budget.