The EST is a guidance document consisting of steps with practical worksheets for conducting qualitative and/or quantitative ES assessment, indicators, advice on relevant issues, and a compendium of tools, methods, and models that might be applied. It is a freely available dynamic PDF. The EST itself does not require computer modelling but guides a practitioner to select appropriate measurement, modelling or other assessment methods.
publications.gc.ca/site/eng/9.829253/publication.htm