Regression methods also can be categorized based on the number of their outputs. While single output regression are the most used ones, the internal correlation between their voters can be set such that they can generate multiple outputs. Therefore, taking the problem of predicting breast shape into account, regressors can be categorized in the two types of Multiple Input Single Output (MISO), or Multiple Input Multiple Output (MIMO). Both types of the aforesaid regressors are studied and evaluated in this work.