> ## Documentation Index > Fetch the complete documentation index at: https://docs.voxworks.ai/llms.txt > Use this file to discover all available pages before exploring further. # Logic Tab and Canvas > The Setup → Logic tab: the routing canvas and its nodes, drawing a rule by dragging, the Routing rules list, rules outside the flow, the question view with rules leaving and arriving, and the Variables card. ## What is the Logic tab? **Logic** is the second tab in **Setup** mode of the [survey workspace](/surveys/survey-workspace). It shows the path a respondent takes through the survey and every routing rule that changes it. The left side is a **routing canvas**; the right side is a panel that changes with what you select. Without any rules, respondents move straight down the survey: every question in outline order, top to bottom. Rules let you skip ahead, show or hide questions, change which options are offered, store values, and end the interview early. Writing rules is covered in [Routing rules](/surveys/routing-rules). *** ## The canvas The canvas draws the survey from top to bottom: | Node | What it is | | ---------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Call start** | The beginning of every call. | | Fixed sections | **Agent**, **FAQs**, **Behaviours**, **Gatekeeper** and **Closing**, each with a lock, a **Fixed** tag and its description. | | Sections and questions | Your authored sections, with a node for each question showing its key, title and `*` if required. Single choice and Rating nodes preview the **Read-out order** of their options, with pinned options marked *Keeps its authored position* and silent options listed as *Volunteered only: …*. | | Endings | Pills for the ways a rule can end the interview: **Complete · (code)**, **Screen out · (code)**, **Terminate · (code)**. | | **Call end** | The end of every call. | Clicking a fixed section on the canvas opens its form in the panel, with **← All rules** to go back. Rules are drawn as connectors between nodes. A shuffled question previews one sample order; each real call gets its own. ### Drawing a rule The panel explains: *"Drag from the blue dot on a question to a later question or an outcome to add a rule, or click a rule on the canvas to change it. Without a matching rule, respondents continue to the next question."* Dragging from a question to a later question starts a jump rule; dragging to an outcome starts an ending. The rule editor opens in the panel with the source and target filled in, ready for you to set the condition. Click an existing connector to open that rule. *** ## The panel with nothing selected ### Routing rules The heading shows the count — *"(n) rules"*, and *"· (n) not run on voice"* when some rules came in with an import that voice calls cannot run. Click **Add rule** to open the rule editor. With no rules the panel reads *"No routing rules yet. Every respondent moves straight down the list."* Rules that are not run on voice are tagged **Not run**. They usually come from an imported survey; they are kept for reference, and a rule marked as containing unsupported routing logic blocks publishing (see [Readiness](/surveys/readiness)). ### Outside the flow *"These fire on events with no fixed position in the presented order, so they are listed rather than drawn."* Rules with imported triggers that voice has no place for — such as a resumed survey or an external event — appear here as a list rather than as connectors. Rules triggered **At the start of the call** are drawn from the **Call start** node. ### Variables The **Variables** card holds the survey's own variables: *"A value the interview carries rather than one question — set it from a rule with “Set variable”, and speak it in a later prompt with `{{survey.var.}}`."* Click **Add variable** to add one. A variable no rule writes is tagged *no rule sets it*. See [Survey variables and piping](/surveys/survey-variables) for the fields and how to use them. *** ## The panel with a question selected Click a question node to focus on it. The panel shows: * **Rule from here** — start a new rule anchored on this question. * **Edit question** (or **View question** on a read-only version) — jump to the question on the [Questions tab](/surveys/questions-tab). * **Leaves from here** — rules that run after this question. Empty: *"No rule fires after this question. Respondents continue to the next one."* * **Arrives here** — rules that jump to or show this question. Empty: *"Only reached in order from the previous step."* A rule that runs at the start of the call is prefixed *At start:* in these lists. The same rules appear on the Questions tab in the **Routing** card under each question, with **Edit in Logic** and **Open Logic** links. A Display question takes no answer, so no rule can fire after it: *"Display steps do not take an answer, so no rule can fire after them."* *** ## Read-only versions On a published, retired or imported version the canvas and rules are view-only. Selecting a rule shows its **Condition** (or **Always**), **Actions**, **Priority** and **Stops others**, with the note *"This version is read-only. Create a Voxworks copy to change its routing."* on imported surveys. For your own surveys, create a draft from [Version history](/surveys/versions) to make changes. Rules imported from another platform can also show a **Preserved source expression — inspected, never executed**: the original rule text, kept for reference only.