Question $4)(15$ points$)$ This question is about your interdisciplinary project. For QFD application projects please see and answer the questions in $4a,$ for UML $($use case$)$ application projects please see and answer $4b.$

$4a.$

$-$How the engineers get improvement ratio?

$-$Suppose that you realize that there is a technical requirement in relationship matrix has strongly negative correlation with the most rated customer requirement. What should you do$?$

$4$b$.$

$-$In what ways Volere Table useful, why did you use it$?$

$-$Explain the given relationships on the use case.