"design approach" is correct and usable in written English.
You can use it to refer to a way of designing something, such as, "We chose a minimalistic design approach for the website."
Ms. Ferlisi's design approach, by contrast, is more forward-looking.
It has adopted a design approach it calls "Fluidic Sculpture".
This has remained a cornerstone of Nintendo's marketing and design approach.
His design approach rests on a muted palette and richly textured materials.
That is the design approach he has mandated for Apple's OS X operating system.
More than ever, Samsung's design approach this time was, "Throw everything in and see what sticks".
One design approach that Dr. Neumann's research team is pursuing is known as a tagged architecture.
Her quirky design approach marries classic pieces with outré detailing; think tiger stripes and heart motifs.
From the start, beginning with the Dezir concept, he called for a new design approach.
Works by the Russian Constructivist El Lissitzky exemplify this design approach.
He's right, but Pidgeon suggests a track at a different level, which a different design approach might allow.
