Input parameters, output parameters and data items can be used to transmit values between process pages by passing or returning values from one page to another2. Lookup stages and calculation stages are not used for this purpose, as they are used to retrieve values from collections or perform calculations on values3. References: 2 https://bpdocs.blueprism.com/bp-6-10/en-us/helpProcessPages.htm  3 https://bpdocs.blueprism.com/bp-6-10/en-us/helpCalculationsAndDecisions.htm