• Valid judgment on the merits
• Actually litigated (or could have been litigated)
• Issue essential to judgment
o E.g., Underlying court finds plaintiff didn't own property in
dispute, but finds defendant was not negligent anyways
o E.g., Underlying court finds doctor is not an agent of the
hospital being sued, but finds negligence issue anyway
o E.g., look for facts peripheral to judgment
o E.g, look for specific findings for the underlying judgment