This chapter contains sections titled: Introduction Covariance analysis for a standard split plot design Covariance analysis for a split block experiment design Covariance analysis for a split split plot experiment design Covariance analysis for variations of designs Discussion Problems References Appendix 11.1. SAS code for Example 11.1 Appendix 11.2. SAS code for Example 11.2 Appendix 11.3. SAS code for Example 11.3