Simplify the following text for a Grade 11 native English-speaking person.
Original: It is referring to the integrated management of design on the level of management , organization and strategy as well as to the management of the design system of the company .
Simplified: It is difficult to exactly trace the history of design management . Even though design management as an expression is first mentioned in literature in 1964 , earlier contributions created the context in which design management could arise .