Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

UML 2 Activity and Action Models, Part 2: Actions



Conrad E. Bock


This is the second in a series introducing the activity model in the Unified Modeling Language, version 2 (UML 2), and how it integrates with the action model [1]. The first article covered motivation and architecture for the new models, basic aspects of UML 2 activities and actions, and introduced the general notion of behavior in UML 2 [2]. The remainder of the series elaborates specific elements in the model. This article recaps behavior models in UML and the role of actions in them. It covers the execution characteristics of actions in general, which inherit to the many kinds of actions provided in UML 2. It also covers additional characteristics of actions that invoke behaviors.
Journal of Object Technology
2 : 5


action model, activity model, control and data flow, process model, UML 2


Bock, C. (2003), UML 2 Activity and Action Models, Part 2: Actions, Journal of Object Technology, [online], (Accessed April 23, 2024)
Created August 1, 2003, Updated November 10, 2018