This advice not provides useful information on the survey of great crested newts. Habitat Suitability Index scoring systems were originally developed by the US Fish and Wildlife Service as a means of evaluating habitat quality and quantity.

This is part of our Good Practice Guidance for Amphibians and Reptiles, produced by Stuart Otway, Jim Foster and Paul Edgar.

Reference: Amphibian and Reptile Groups of the United Kingdom (2010). ARG UK Advice Note 5: Great Crested Newt Habitat Suitability Index. ARGUK