After you finish setting your policies global properties and declaring data collected by your Web site, check your policy for P3P errors and verify the contents of your policy.
The IBM P3P Policy Editor will check that the policy you have created is valid according to the rules in the P3P specification. Use the Errors view to check if the policy has any errors which must be corrected. As a quick reference, if the policy has any errors or warnings, the title for the Errors tab will be shown in red; if the policy has no errors or warnings, then it will be shown in black.
Before publishing your policy, it is important to check that the sites's practices are correctly captured by the policy. The editor provides several views of your policy to help you with this:
Remember that P3P policies may overstate a site's practices, but never understate the site's practices. That is, the policy states how the site may use the data it mentions; if the site does not do one of the actions listed in the policy, then the policy is still considered accurate. However, if a site uses data in ways which are not mentioned in the policy, then the policy is invalid, and may be misleading to a site visitor.