The following report is the result of a project carried out by the undersigned student at Mälardalen University in Eskilstuna, Sweden. This report comprises a product development project of a ceiling- and interior wall fixture for the company Husmuttern AB. Today, Husmuttern AB is working on developing concept in open innovation where ideas are gathered from crowd innovation in consultation with subcontractors and students from Mälardalen University. The vision is that anyone, regardless of their education or experience level, should be able to assemble a modular housing using the tools provided by Husmuttern AB. The fixture should be flexible and be useful for both ceiling, interior wall and interior wall with door and be designed for an e...