During last several years, five largest Korean shipbuilding companies and Korean Register have supported the development of WISH. Similar to SWAN and LAMP, WISH can apply three different levels of analysis, linear, weakly-nonlinear and weak-scatterer approaches for the analysis of ship motion responses and structural loads. This program is based on a three-dimensional Rankine panel method, and the time-domain formulation is applied (Kim et al., 2008; Kim and Kim, 2009c). During the development of WISH program, systematic verification and validation were performed by comparison with experimental data and/or other numerical results. Based on such study, the accuracy of WISH program has been evaluated, and it has been distributed to industry.