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Abstract.A promising approach to managing business operations is based on business entities with lifecycles (BEL's) (a.k.a. business artifacts), i.e., key conceptual entities that are central to guiding the operations of a business, and whose content changes as they move through those operations. A BEL type includes both an information model that captures, in either materialized or virtual form, all of the business-relevant data about entities of that type, and a lifecycle model, that specifies the possible ways an entity of that type might progress through the business by responding to events and invoking services, including human activities. Most previous work on BEL's has focused on the use of lifecycle models based on variants of finite state machines. This paper introduces the Guard-StageMilestone (GSM) meta-model for lifecycles, which is an evolution of the previous work on BEL's. GSM lifecycles are substantially more declarative than the finite state machine variants, and support hierarchy and parallelism within a single entity instance. The GSM operational semantics are based on a form of EventCondition-Action (ECA) rules, and provide a basis for formal verification and reasoning. This paper provides an informal, preliminary introduction to the GSM approach, and briefly overviews selected research directions.

For almost a decade, the artifact-centered operational-modeling approach for modeling business operations, also referred to as the ''business artifact method,'' has been practiced and refined. This approach has been used in a variety of engagements, and each engagement has brought forth innovations that have enriched and strengthened the approach. In this paper, we describe three of these engagements in order to illustrate the method and highlight some of the lessons learned. The main objective of this paper is to establish the value of operational modeling in business transformation and to incorporate the lessons we have learned into a more comprehensive account of the method. We also describe the model-driven business transformation toolkit, which adds a unique value proposition to the method-the rapid and effective transformation of operational models into implementations that are manageable and can be monitored. 4 At the outset, the ACOM approach was seen as simply an alternative to more familiar approaches,

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