The Rice Index is the first measure of voting unity devised. It is noted that this measure was developed on an ad hoc basis for use in rather rough comparisons. This measure is carefully assessed, and is noted to have the virtue of simplicity, useful in certain situations, but associated with certain problems when it is used for a more detailed analysis. Two other measures of voting unity are called The Probability of Agreement Measure and The Alpha-Index. Each measure is presented with exercises, theoretical problems, and a bibliography. Solutions to the exercises and problems are provided. (MP)