Washing machine and method of controlling same

A method of controlling a washing machine, the method comprising:

• receiving a washing course selection from a plurality of washing courses;
• sensing an amount of laundry received in an inner tub of the washing machine and determining a wash water level for main washing;
• supplying water up to a steam water level for generation of steam based on the selected washing course, wherein the steam water level for generation of the steam is above a bottom surface of the inner tub and lower than the wash water level for main washing;
• heating the water supplied to the steam water level to a first set temperature and generating steam from the heated water and supplying the generated steam to the inner tub based on the selected washing course, wherein heating the water to the first set temperature comprises driving a heater provided at an outer tub in which the inner tub is received;
• supplying water up to the wash water level for main washing;
• and
• performing a main washing process for the main washing.