[personal UX reflection: holistic approach] an enlightening thought about product development at a civil-defense training

story: At a civil-defense training today esp. on fire prevention, a thought came up that designers and engineers need to take a great consideration even in selecting materials for doors knobs because the knobs can become a guiding signal whether the room behind is on fire or not by transmitting heat on the material. By making it with perhaps copper or heat-transferable material, the careful selection of material may save lives for people who are trying to escape in a panic room caused by fire. 

lesson: all people involved with product development (e..g product managers, designers, engineers) need to approach the product's design with a holistic and inclusive perspective to think beyond its directly intended function; though a decision made for a material choice for the product may seem small, the decision can save lives.