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So far Bruce Silver has created 441 blog entries.

Routing Decisions and the DMN Method

By | 2016-12-29T13:40:00-08:00 March 15th, 2016|BPMN, DMN|

In my book DMN Method and Style I find some fault with both The Decision Model (TDM) and the Lending example in the DMN 1.1 spec for delegating definition of a multi-step business decision to a BPMN process model instead of to where it rightfully belongs, a DMN decision model.  To me, determining something like  [...]

What Is DMN?

By | 2016-12-29T13:40:00-08:00 February 29th, 2016|DMN|

DMN, which stands for Decision Model and Notation, is a relatively new standard managed by OMG, the organization behind BPMN.  It is trying to do for Business Decision Management what BPMN did for Business Process Management a decade ago: empower the business to take charge of the logic that drives its operations, through a vendor-independent [...]

DMN Business Knowledge Models – Love ’em or Hate ’em?

By | 2016-12-29T13:40:00-08:00 February 17th, 2016|DMN|

If you're like most people trying to find out about DMN by reading the spec, you focus on the diagrams and examples.  And you probably come away thinking, Yikes, what a mess!  The thing that elicits this response from most people is the proliferation of business knowledge models (BKMs), those rectangles with clipped corners that seem [...]

Is FEEL a Barrier to DMN Adoption?

By | 2016-12-29T13:40:00-08:00 February 7th, 2016|DMN|

In his comment on a recent post, Nick Broom questions my embrace of FEEL, in particular my claim that it is reasonably business-friendly.  He worries that in fact that FEEL will prove a barrier to DMN adoption, especially since decision management tools are being sold on the premise that "anyone can do it."  A lot [...]

DMN Method and Style – New Book and Training Now Available

By | 2016-12-29T13:40:00-08:00 February 5th, 2016|DMN|

I've been heads-down for a while working on a new book and training: DMN Method and Style.  The Decision Modeling and Notation standard now promises to transform the world of proprietary decision management software in the same way that BPMN upended the world of workflow, EAI, and business process analysis software a decade ago.  Do [...]

DMN Demystified, Part 8. What’s Not in DMN 1.1

By | 2016-12-29T13:40:01-08:00 January 29th, 2016|DMN|

DMN 1.1 is the first implementable version of the standard.  The spec is done, but won't be released to the public until mid-2016.  A lot of work went into it, so people are surprised at all the things that are not in it: Business glossary.  Howls of anguish went out online when it was revealed that [...]

DMN Demystified, Part 7. Conformance Levels

By | 2016-12-29T13:40:01-08:00 January 29th, 2016|DMN|

While unifying decision modeling and execution is a laudable goal, OMG realizes not all DMN vendors and practitioners want to do that.  So DMN defines three levels of conformance to the standard.  A tool vendor can implement just a sliver of DMN and still proudly slap that "standards-based" label on their software. Conformance Level 1 (CL1) [...]

DMN Demystified, Part 6. Key Element 5: Metamodel and Schema

By | 2016-12-29T13:40:01-08:00 January 29th, 2016|DMN|

All of the conceptual elements of DMN - their names, attributes, relationships to each other, whether they are required or optional, and so forth - are formally defined in the specification by a metamodel, a set of UML class diagrams.  Here, for example, is the metamodel for a Decision: Closely related to the metamodel is [...]

DMN Demystified, Part 5. Key Element 4: Boxed Expressions

By | 2016-12-29T13:40:01-08:00 January 29th, 2016|DMN|

Last time I mentioned that FEEL is just an expression language not a programming language.  It does not have statements.  It cannot create variables.  But, of course, you need those to define executable decision logic!  So where do they come from? What makes DMN business-friendly is that variables and their value expressions are created graphically, in diagrams [...]

DMN Demystified, Part 4. Key Element 3: FEEL

By | 2016-12-29T13:40:01-08:00 January 29th, 2016|DMN|

If DMN just wanted to be a requirements-gathering notation along the lines of BPMN 1.x, DRDs and decision tables would be enough.  (And unfortunately, to many decision management vendors and consultants, those are enough!)  But DMN has higher aspirations.  Like BPMN 2.0, it seeks to unify modeling and execution in a single language, accessible to [...]