In RaQuest, many-to-many relationships between requirements (or requirements and use cases, UML items or members) can be defined. You may need to check relationships and edit them. RaQuest provides a matrix view to show relationships between requirements and other items. The feature makes it easy not only to check relationships visually, but also to create and delete relationships.
•Requirements Matrix
•Member Matrix
•Use Case Matrix
•UML Item Matrix
review required relationships : 
The following operations are possible.
•Target
Specify the target element and the package to display.
oRequirement, Member, Use Case, UML Item
Specify the elements of the target.
oUpper
Specify the requirements package. (select with button)
oLower
Specify the package of the element. (select with button)
oFilter button
Specify the filtering keywords.
oCombo box
Specify the target element type.
•Color unrelated
Display rows or columns, which have no relationship, in red in the matrix.
•Update
Update the current matrix.
•Export CSV
Export the matrix data to a CSV file.
•Export RTF
Export the matrix data to a RTF file.
•Close
Close current matrix.
•Double click a cell
When there is no relationship, make a new relationship. When there is already a relationship, delete or change the direction of the relationship.
•Click a header
Sort the row or the column.
•Right click on the matrix.
Display the following menu.
Option menu
Create or delete relationship menu
By setting "Resizable height/width" to ON in options menu, you can change the width and height of the header line, and change the amount of the requirement summary displayed.