In this and in an earlier paper formulas are given for analysing genetic variation in general (connected) diallel cross designs, including incomplete and unbalanced designs. Also North Carolina II (NC II) designs are considered. In this paper the procedures are illustrated by the example of an irregular incomplete diallel cross. The use of the general formulas for the random model analysis, given by K euls & Garretsen (1977), is illustrated by this example. General formulas for the fixed model analysis are given in this paper. A fixed model analysis of variance is illustrated, providing F-tests and estimating reduced parameters with their variances, with Bonferroni-t-tests (against zero) of estimated parameters. © 1978 H. Veenman En Zonen B.V.