To ensure that valid data is used in a case, you need to make sure that the data fits the business logic and the data is the correct field type. The data fits the business logic means that the data conforms to the rules and constraints that define the business problem and solution. For example, you can use validations, calculations, and dependencies to ensure that the data fits the business logic. The data is the correct field type means that the data matches the expected format and structure of the field that stores or displays it. For example, you can use different types of fields and controls to ensure that the data is the correct field type. Reference: https://community.pega.com/knowledgebase/articles/user-interface/86/ensuring-valid-data-used-case