openEHR Task Planning – a visual model of clinical workflow

We have been making steady progress on the openEHR Task Planning specification and visual modelling language (TP-VML) for clinical workflow. One of the differentiators of Task Planning, is that, like YAWL, it is designed as a formalism for developing fully executable process plans. This means that all the semantics of a TP Plan are formally defined and executable in a TP engine. It also means that the accompanying visual language, TP-VML, consists of visual elements formally related to the TP model. This is in contrast with BPMN, which is defined as a diagramming language with some formal elements mixed in, and other formal requirements expressed separately in the specification. Nonetheless, we are carefully studying the semantics of OMG’s BPMN2 / CMMN / DMN specifications to make sure we cover the necessary requirements, and use the same conceptual terminology as far as possible.

It is early days for TP-VML of course, and we are still learning, but I believe that following the basic paradigm of a visual language being an outcome or a view of a formal model will produce a diagramming notation comprehensible to humans while being directly convertible to executable TP model instances. In other words, a visual workflow programming language.

Here is a taster of where we are right now.

Task Group Structures

Decision Structures

One kind of decision structure:

Task Types

Event Types

Draw.io Mode

The above visual language is initially being developed as a draw.io set of stencils, which are available here. They can be imported into the draw.io tool and provide a modicum of efficient TP-VML drawing capability. Note: the Chrome plug-in version is somewhat nicer to use than the pure online version. The future is of course a tool more like Camunda.

Examples of Use

Have a look at the Task Planning specification for some examples of use of TP-VML. We also have a growing set of examples produced by DIPS (major Norwegian EMR system vendor), available on Github.

About wolandscat

I work on semantic architectures for interoperability of information systems. Much of my time is spent studying data, ideas, and knowledge, and using methods from philosophy, particularly ontology and epistemology.
This entry was posted in Computing, Health Informatics, openehr and tagged , , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s