Principle 3. Local quality

1. Change an object's structure from uniform to non-uniform, change an external environment (or external influence) from uniform to non-uniform.
   - Use a temperature, density, or pressure gradient instead of constant temperature, density or pressure.
2. Make each part of an object function in conditions most suitable for its operation.
   - Lunch box with special compartments for hot and cold solid foods and for liquids.
3. Make each part of an object fulfill a different and useful function.
   • Pencil with eraser
   • Hammer with nail puller
   • Multi-function tool that scales fish, acts as a pliers, a wire stripper, a flat-blade screwdriver, a Phillips screwdriver, manicure set, etc.