DTI also offers design projects to be extended to full PhD programmes.  Two to three years are added to the DTI prgram to complete a PhD.  The PhD study is a "dissertation on a technological design".  The company of the regular DTI project cooperates to finance the PhD extension when the design project is important for the strategic R&D of the company.

The degree is fully equivalent to the typical "scientific" PhD.

Check this overview of recent and current PhD's on Design

DTI PhD on Design

DTI PhD on Design