How is iteration used in engineering design? why is this such an important aspect of the process?

The cycle of prototyping, testing, and refining that's at the core of iterative design offers numerous benefits: Testing gives you a valuable collection of user feedback that you can use to improve your site and to understand what's working for you. It helps you catch problems before they spiral out of control.

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

a) the particles of the chair are strongly held together.