The significant problems we face cannot be solved at the same level of thinking we were at when we created them. Albert Einstein, 1879-1955. Thus, problem formulation is the first part of the design problem and decisions making at the conceptual phase of product design is crucial. Against the background: 1. Identify the sustainable principle criteria impacting product design. (UN-4) 2. Critically examine the cause and the effect of toxicity in the context of mobile phone development. (AN-6) 3. Evaluate the risk from the hazard of toxicity. (EV-7) 4. What technology choice is suitable for water proof cellular phone design?