Use of Decision Table

[kpathak1803]

Hello ,

Can You give me brief about Decision Table. It will help me.

[ReginaldFawcett]

Decision Tables are used in cases where there are many different inputs, and many different outputs.
For an example say you have input variables 1 and 2, with values a b and  c d, and output assignment groups red, blue, green, yellow.
You could construct logic in your flow like
if a c - red

if a d - blue

if b c - green

if b d - yellow

This tends to clog up your flow and does not scale well.
Instead you can add this logic to a decision table and just output the assignment group.
The way it works in a Flow is that you send the table the inputs from your variables and it will send you back the decision based on your table.

Here is a video by ServiceNow to explain it in more detail.

https://www.youtube.com/watch?v=6hrahcfjARY

[aruncr0122]

Hi @kpathak1803 ,

A Decision Table in ServiceNow helps you make complex decisions easily by using a simple table format.
Each row represents a rule — when certain conditions are met, a specific action or result is returned.

It lets you manage business logic without writing scripts, making it easier to maintain and update.

⚙️ How It Works

Structured Table:
Columns represent the inputs (conditions) and outputs (results/actions).

Rows = Rules:
Each row defines what action to take when certain inputs match.

Inputs/Outputs:
The table checks the input values (like user role or department) and returns the correct output (like assignment group or approval path).

🌟Benefits

Simplifies complex decision logic.

No need to update scripts — just update the table.

Easier to understand for non-developers.

Speeds up development and maintenance.

💡Common Use Cases

Incident Routing: Assign incidents automatically based on priority or department.

Employee Onboarding: Assign hardware/software based on the new hire’s role.

Change Management: Choose the right approval process based on risk and impact.

🖼️ Visual Example

Here’s what a simple decision table might look like:

User Role        Department         Priority         Assigned Group
IT Analyst        IT                             High             IT Support
HR Manager   HR                          Medium      HR Service Desk
Developer       Engineering         Low              DevOps Team