Three focus areas for prioritization: species, pathways, and sites
Targeting species, pathways and sites for prioritization is needed to enable effective invasion policy and management. Integrated prioritization across these three focus areas is likely to lead to improved outcomes and efficiencies in resource allocation.
The figure below shows examples of combined prioritized risks associated with these focus areas, with the example in the centre being ornamental species in gardens as escapees (pathway) into adjacent protected areas (sites). 
The three focus areas for a comprehensive approach to prioritizing investment in the management of biological invasions [from 1]
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Referenced material and links
McGeoch, M.A., Genovesi, P., Bellingham, P.J., Costello, M.J., McGrannachan, C. & Sheppard, A. 2016. Prioritizing species, pathways, and sites to achieve conservation targets for biological invasion. Biological Invasions 18, 299-314. doi 10.1007/s10530-015-1013-1