In considering whether a situation creates a threat to their objectivity, a professional valuer should recognise that it is often the perception of possible bias by others that creates the threat to the credibility of the valuation. There will be situations where some past or current involvement with either the asset to be valued or a party interested in that asset creates no material threat to objectivity but which could give rise to a perception of bias if subsequently discovered by a party who has relied on the valuation. Disclosure of any such involvement in the scope of work and report can be an effective means of avoiding any perception of bias.