classes:  lecturer. There should be a clear orientation in each practice lesson, i.e. when the practice is completed, it can be applied as a practical product.  curriculum. There should be a clear orientation in each practice lesson, i.e. when the practice is completed, it can be applied as a practical product.  facility. There should be a clear orientation in each practice lesson, i.e. when the practice is completed, it can be applied as a practical product.  general. There should be a clear orientation in each practice lesson, i.e. when the practice is completed, it can be applied as a practical product.