Workflow

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(Redirected from Workflows)

Workflow is the operational aspect of a work procedure: how tasks are structured, who performs them, what their relative order is, how they are synchronized, how information flows to support the tasks and how tasks are being tracked. As the dimension of time is considered in Workflow, Workflow considers "throughput" as a distinct measure. Workflow problems can be modeled and analyzed using Petri nets.

While the concept of workflow is not specific to information technology, support for workflow is an integral part of groupware software.

Distinction can be made between "scientific" and "business" workflow paradigms. While the former is mostly concerned with throughput of data through various algorithms, applications and services, the latter concentrates on scheduling task executions, ensuring dependencies which are not necessarily data-driven and may include human agents.

Scientific workflows found wide acceptance in the fields of bioinformatics and cheminformatics in the early 2000s, where they successfully met the need for multiple interconnected tools, handling of multiple data formats and large data quantities. Also, the paradigm of scientific workflows was close to the well-established tradition of Perl scripting in life-science research organization, so this adoption represented a natural step forward towards a more structured infrastructure setup.

Business workflows are more generic, being able to represent any structuring of tasks, and are equally applicable to task scheduling within a software application server and organizing a paper document trail within an organization. Their origins date back to the 1970s, when they were purely paper-based, and the principles from that period made the transition to modern IT infrastructure systems.

As a way of bridging the gap between the two, significant effort is being put into defining workflow patterns that can be used to compare and contrast different workflow engines across both of these domains.

Contents

Workflow systems

Workflow systems are defined as "systems that help organizations to specify, execute, monitor, and coordinate the flow of work cases within a distributed office environment".

The system contains two basic components: first component is the workflow modeling component (sometimes called the specification module or the build time system), which enables administrations and analysts to define process and activities, analyze and simulate them, and assign them to people. The second component is the workflow execution component, sometimes called the run-time system. It consists of the execution interface seen by end-users and the workflow engine, an execution environment which assists in coordination and performing the processes and activities.


See also

References

External links

  • Tools for scientific workflow
    • Taverna Open-source workflow system particularly focussed on bioinformatics applications
    • Kepler Open-source scientific workflow system, based on Ptolemy II
    • GridNexus UNC Wilmington scientific workflow grid computing project, also based on Ptolemy II
    • SPA Scientific Process Automation, scientific Problem Solving Environment (PSE) with an intuitive graphical user interface that allows scientists to easily create exploratory data flows (workflows). Also based on Ptolemy II
    • Triana GUI based scientific workflow, for domain independent applications.
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