Functions may Reuse Functions. The lower level of Function is called Basic Function.

Component reused at execution time through an Interface, and thanks to a middleware if not in the same IT Resource.
Ex: Software Service "Am I authorized to do it ?"

A Solution software can be big: it is broken down into a hierarchy of Blocks which interface with other
Blocks to share Software Services or Data Services.
For some IT Systems, it is possible to classify each Block level such as Area, Zone, ...

Representation of the hierarchy of Blocks and of their exchanges to understand the software Model.
It helps to reuse Black Components thanks to clean interfaces. It also helps to localize and simplify
evolutions: modification or replacement of Blocks

Person or Legal Entity involved in an End to End Process: Customer, prospect, partner, provider,
Government Entity. Each Business Actor owns a Business Actor Role such as Customer, Partner…

Entity necessary for Business, independently of the Organization of the Enterprise, such as Product or
Customer, Contract or Account.

Function of an End to End Process.
Example: check data entry, compute price, send message to Customer.
Not to be confused with Organization Functions.

A set of Functions that are executed all together. The set of Functions is completely executed,
suspended as a whole, or abandoned completely, thus ensuring a consistent state before and after it is
applied.
Example: To transfer money from one Account to another, a debit is applied to the first and a credit to
the second. To ensure that the two Accounts are updated together, the Functions debit and credit are
applied in the same Business Transaction.