we can say that the designer must take
into account a number of Prior design goals including:

-1 To enter the
designer in his account and use functions and requirements all .

-2 To take into
account all the circumstances surrounding theFriendly.Which sometimes overlap
or conflict or contradiction.

3. The designer
takes into account the great diversity of information available to him,

4. The designer
calculates the possibilities of use for the next one case

-5 To be a designer
in an accurate cost calculation so that achievement comes Distinct or possible
alternatives in the event of circumstances requiring the replacement of Friendly.

Set design at the
lowest cost and requirements of time and effort And physical possibilities.