# What's New: New and Upgraded Model Editors

Create and reparameterize models simply with the new editors

The "Add Model" tool has been significantly upgraded allowing C models to be constructed as well as the ability to enable different options directly from the GUI. Finally, the generated code is now heavily documented to make clear exactly what the user should do to achieve different effect.

The new Reparameterization Editor, based on the same concept as the classic Model Editor, now allows the user a relatively simple way to create new "parameterizations" of existing models. For example, replacing the core radius, shell and core SLDs of the core-shell sphere model with the micelle aggregaion number and the fraction of water in the head group region assuming known SLDs for the surfactant head and tail.