iLogic rules are used to manipulate design elements in a model based on different user input. The ability to write rules in iLogic adds endless possibilities to the way we can manipulate our designs. The iLogic interface for writing rules provides us with many of the functions, feature lists, etc. that are needed to quickly and accurately control the design. This makes it much easier to automate designs based on engineering criteria. Although many have found that some basic programming experience can go a long way, many will find that it is not required to get iLogic to do what you need it to do. We are going to look at creating some simple rules to change our fence design based on the iLogic parameters we created in Part 2.