Disclosed is a direct-drive washing machine enabling to revolve a pulsator only or both of the pulsator and inner tub in accordance with a load condition such as a laundry quantity, a washing water quantity, etc, a fabric condition, and the like so as to realize an optimal washing condition as well as improve a washing efficiency. The optimal sequencing method is adaptive in the sense that it continuously monitors a student’s speed and accuracy of response in answering a series of questions, performing a series of classification tasks, or performing a series of procedures, and modifies the sequencing of the items presented as a function of these variables. The envelope also has an interior watertight lining joined with the ziploc strip to seal the contents within from wetness or to prevent leakage of liquid items placed inside the envelope.