Harrison's terms of reference:
Terms of reference to provide assistance to the Portuguese Judicial Police.
1. Assist the Judicial Police and GNR in assessing new or previous areas searched and give opinion on the best methods and assets to provide assurance as to the absence or presence of M McCann's concealed remains.
2. Act as a "critical friend" to the officer in charge of search planning and management and offer immediate and enduring peer review until case resolution or search suspension.
3. Assist in the development of framework models such as scenario based searching to aid homicide disposal searching.
4. Consider further opportunities or areas for search in order to locate M McCann (locate, rather than find) as applicable to the latest intelligence and informtion provided.
5. Where appropriate, provide independent and impartial advice on the enabling and disabling factors of specialist resources available either within Portugal or elsewhere in body detection.
6. To assist in decision support where requested by testing and challenging claims made by persons offering unorthodox search methods or devices to aid locating M McCann.
7. Where appropriate and requested, assist in advising on procedures to procure any non Portuguese specialist assets that are deemed to be relevant and useful.
So did Harrison write his own terms of reference?