The DISCO convention is designed to categorise types of modules. Within a functional area you may have multiple types of modules
Exception:
2.01-05a Simple models: If the model is simple, DISCO can be used as the naming for functional areas
Related to Rule:
2.01-04 Use the DISCO methodology for Module design
Questions on this topic? See 2.01-05 Don't Use DISCO as Functional Areas in our Planual forum.