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Lean is a business process improvement methodology with its core idea is to maximize customer value while minimizing waste.
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In the context of Enterprise Architecture (and its various domains), Logical refers to the removal of implementation-independent concepts to create a logical view of an architecture.
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A Merge in a process is a point where two or more alternative process flow paths are combined into one process flow path.
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A Message, as specified and used within BPMN 2.0, is an Object that depicts the contents of a communication between two Participants.
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A Message Flow is a connecting object that shows the flow of messages between two Participants.
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Metadata refers to the data that is used to describe data and the characteristics of an entity.
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A Metamodel consists of the frameworks, rules and constraints defined to underpin the creation of a model. In very simple terms, it is the model that underpins a model.
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A Method is a defined and repeatable series of steps capable of achieving a specific purpose, solving a specific problem or acquire knowledge.
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A Methodology is the analysis of different methods and approaches to collect details of various 'best practice' methods capable of addressing various forms of common problems.
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Model is constructed to provide a representation of a subject area of interest. The model provides a smaller (scale), simplified, and / or abstract representation of the subject area.