There is no law determining the length of a probationary period. However, there is an expectation that the employer will be reasonable. It is typical for a probationary period to last no longer than six months, and three months where an employee is moving to a new post internally.
A training bra (also trainer bra or bralette) is a lightweight brassiere designed for girls who have begun to develop breasts during puberty when the girl's breasts are not yet large enough to fit a standard-sized bra. Breast growth is usually defined by the Tanner scale. Girls who are developing breasts are at Tanner stage I and II. Training bras are usually a lightweight, unlined, pullover style bra and feature a soft, elastic bra band and soft bra cups.
In many areas of information science, finding predictive relationships from data is a very important task. Initial discovery of relationships is usually done with a training set while a test set and validation set are used for evaluating whether the discovered relationships hold. More formally, a training set is a set of data used to discover potentially predictive relationships. A test set is a set of data used to assess the strength and utility of a predictive relationship. Test and training sets are used in intelligent systems, machine learning, genetic programming and statistics.