Throughout this chapter, we looked at the main component of the three system modules: an entity. We defined what an entity is and we looked at what an entity is composed of. Then, we looked at each of the components in detail and we discussed ways in which we can customize the entities and extend the system. We investigated ways to visually represent the data related to entities and how to relate entities for data integrity. We also looked at how to enhance entity behavior with business rules and the limitations that the business rules have versus more advanced customizations, using scripts or other developer-specific methods.

The next chapter will take you into the business aspect of the Dynamics CRM platform, with an in-depth look at all the available business processes. We will revisit business rules, and we will take a look at other ways to enforce business-specific rules and processes using the wizard-driven customizations available with the platform.