Decision tables workflow

  • Release version: Zurich
  • Updated July 31, 2025
  • 2 minutes to read
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    Summary of Decision tables workflow

    Decision tables in Workflow Studio enable ServiceNow customers to separate decision logic from application code, allowing for more maintainable and efficient flows, subflows, playbooks, and scripts. This approach allows business subject matter experts (SMEs) to manage decision logic directly, reducing reliance on developers and supporting frequent updates without code changes.

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    Key Features

    • Creation and management: Developers create decision tables by defining inputs, outputs, condition columns, and decision rows to represent complex conditional logic in a readable and structured format.
    • Collaboration: Both developers and business SMEs can build, test, and publish decision tables, supporting non-developer management of business logic.
    • Integration: Decision tables can be referenced within code snippets, flows, subflows, and playbooks using specific activities like "Make a decision" or "Make a Decision - First Match".
    • Version control: Updates to decision tables can be managed through draft versions that are tested before publishing, ensuring controlled changes to decision logic.

    Practical Benefits

    • Improves maintainability by replacing complex nested conditional code with configurable decision tables.
    • Allows frequent and independent updates to decision logic without modifying underlying scripts or flows.
    • Enables sharing and reuse of decision logic across multiple workflows and scripts.
    • Empowers business SMEs to manage application logic directly, aligning IT workflows with business needs.

    Learn how to create and maintain decision tables in Workflow Studio for use in flows, subflows, playbooks, and anywhere on the ServiceNow AI Platform where you write code.

    Decision tables enable you to decouple decision logic from your code. This means that you can create a decision table in Workflow Studio with your application logic and then reference the decision table to execute the logic elsewhere, such as in a flow , playbook, or script. This decoupling enables you to create more efficient and maintainable flows and scripts and allows the decision logic to be managed directly by the relevant business subject matter expert.

    Workflow for creating decision tables

    The following illustration depicts the process for creating decision tables in Workflow Studio.

    Figure 1. Process for creating decision tables
    Infographic depicting the process of creating a decision table in Workflow Studio
    The workflow for creating decision tables in Workflow Studio is as follows:
    1. A developer is writing a script or authoring a flow or subflow and realizes there is a need for a decision table. Decision tables are a more maintainable solution than hard-coded logic for the following scenarios:
      • There is a complex set of conditional, nested if/else or switch statements in the code.
      • The logic powering the code might change frequently.
      • There is a need to share the application logic with non-developers in a readable format.
      • There is a need for application logic to be managed independently from where it is implemented.
      • There is a need for application logic to be managed by non-developers.
      • There is a need to apply the same logic in more than one flow, subflow, or script.
      • There is application or business logic the developer wants to manage separately from the code.
    2. The developer creates the decision table in Workflow Studio and adds inputs and result columns (outputs for the decisions).
    3. A developer or a business subject matter expert (SME) can perform the next steps.
      1. Add condition columns to structure the rules.
      2. Add decision rows to build conditional rules and corresponding results.
      3. Test the decision table.
      4. Publish the decision table.
    4. The developer can use the decision table in a few ways.
      • They can create a code snippet of the decision table and insert it into their code.
      • They can add Make a decision logic in their flow or subflow and reference the decision table.
      • They can add a decision table to a playbook using the Make a Decision - First Match activity.
    5. If the decision table must be updated to reflect new logic, the developer or business SME can create a new draft of the table. They can test the table using the new logic and then publish the new version. To create a Decision Table, See Create decision tables in Workflow Studio.
      Note:
      For any decision table that doesn't use draft authoring, any change the developer or business SME makes is automatically active.