This program is written in Visual Basic® for Applications and runs within MS Excel® . The model combines population dynamics and search theory to calculate the probability that a weed invasion will be eradicated based on the amount of time invested in searching for it (search effort).

This is work in progress. It is envisaged that the software will continue to evolve as it is tested by experts and feedback is received. The original concept for this software was developed by Paul Pheloung (from the Australian Department of Agriculture Fisheries and Forestry) in connection with a project on the Galapagos Islands. The software evolved through the incorporation of search theory and matrix population models.