As an interior design assistant, you perform a number of administrative, clerical, and creative duties under the supervision of an interior designer. You communicate with the client to arrange meetings and consultations with the designer, collect photographs and measure rooms during a site visit, and provide the client and the designer with samples, mock-ups, and reports on budgets. You also have administrative responsibilities, which involve dealing with the various vendors your boss uses, such as the furniture supplier, hardware store, and contractors who may be used to complete a job.