> ## Documentation Index > Fetch the complete documentation index at: https://docs.utopikai.com/llms.txt > Use this file to discover all available pages before exploring further. # Logic > Branch, loop, and pause a workflow for approval Logic nodes control the path a workflow takes. Add them from the **Logic** group in the node library. ## Condition **Condition** branches the flow. The node has **If** and **Else** outputs. Connect each output to a different path. Write an expression that evaluates to true or false, for example `input.score > 70`. Insert variables from previous nodes or **lastOutput**. Condition node ## While **While** repeats steps while a condition is true. The node has **Continue** (loop body) and **Break** (when the loop should stop) outputs. Write the loop condition, for example `iteration < 10`. Insert variables from previous nodes, **lastOutput**, or **iteration**. Set a **Safety limit** (maximum iterations) so the loop cannot run forever. Connect the loop body to **Continue**. The workflow repeats until the condition is false or the safety limit is reached. While node ## User Approval **User Approval** pauses the workflow until a person approves or rejects the step. The node has **Approve** and **Reject** outputs. 1. **Approval message** — Text shown to the reviewer. You can include `${variable}` placeholders. 2. **Insert variables** — Values from previous nodes or **lastOutput**. 3. **Timeout** — How long to wait before the step times out. The **Approve** path continues when the step is approved. The **Reject** path continues when it is rejected or the timeout is reached. User Approval node ## Related documentation * [Workflows Overview](/workflows/overview) * [Editor](/workflows/editor) * [Agent](/workflows/agent)