Design capacity' refers to

the output of an operation considering both planned stoppages and unplanned losses (e.g. poor work rate, absenteeism, new staff training...)

the expected output that an operation can produce continuously, at the maximum rate without stopping

the ability of an organisation to design their products to meet customer needs

the sum of effective capacity and actual capacity of the organisation

the expected output of an operation considering planned stoppages (e.g. maintenance, shift changeovers, delays...)