Four fundamental principles relating to intangible assets:
1. They must have an "enduring" nature. 2. Where identifiable intangible assets (i.e. other than goodwill) have values that can be determined separately, those should be added to the FMV (on a going-concern basis) of the tangible assets for purposes of measuring the going-concern value of operations.3. The value of an intangible asset must relate to the expected cash flow or earnings to be generated from it. 4. Must be transferable if goodwill is to have commercial value.