A(n) Plus sign in a class diagram indicates public access. By composing data fields private and providing access to them solely through a class method you preserve the systems in which data can be modified and accessed. An in a class diagram designates public access. The relationship formulated with composition is termed as an n relationship. Delivering an operation on an icon makes an which is an experience that creates a message sent to an object. Plus sign in enhancement to their properties class objects have methods connected with them and each object that is an object of a class maintains different methods.