ECAD > Working in ECAD-MCAD Collaboration Mode > To Compare the Current ECAD Assembly With its Base Design
  
To Compare the Current ECAD Assembly With its Base Design
1. Open the ECAD assembly design that you saved as the Base design.
2. Modify the board outline of the assembly design.
3. Add, delete, move, and modify the components of the assembly design, as required.
4. Click Applications > ECAD Collaboration.
5. Click Compare. The Select Assembly to compare against dialog box opens.
6. Click Compare against an *.eda file or retain the default selection of Compare against an assembly iteration.
7. Click the Open dialog box opens. Type is set to Assembly (*.asm) or ECAD EDA (*.eda), depending on your selection of Compare against an *.eda file or Compare against an assembly iteration.
 
• Click Tools > All Versions to make sure you select the correct version of the assembly.
• When you are using Windchill, you can only compare against the last saved iteration in the workspace.
8. Select the Compare To *.eda or *.asm file.
9. Click OK. Creo View ECAD Validate opens in a separate window displaying the comparison results.
 
* The comparison fails when no unique top and bottom surfaces are defined for an ECAD assembly or PCB design with multiple top and bottom surfaces. To continue with the comparison, select the top and bottom planes or surfaces that are normal to the z-axis of the coordinate system.