# Describe a FactorySpec constraint in plain English Type a product configuration rule in plain English, answer the AI's question about the details it needs, inspect the complete proposed constraint, save it deliberately as a draft and request the native engineering review. Source: https://help.smartfact.ai/automation/guides/factoryspec-assistance Audience: Author Type a product configuration rule in plain English, answer the AI's question about the details it needs, inspect the complete proposed constraint, save it deliberately as a draft and request the native engineering review. ## Plain English to a checked draft 1. **Load the FA-300 family draft** Load the FA-300 family draft Load the frame assembly FA-300 draft from FactorySpec. Its expected results, worked out by hand from drawing FA-300, say a black frame with a clear panel must be blocked, but the model has no constraint for it yet. 2. **Choose Add constraints entry** Choose Add constraints entry Choose Add constraints entry. A constraint blocks a combination of options that cannot be built. 3. **Load the constraint controls** Load the constraint controls Load the controls for a new constraint. This reads FactorySpec and does not save anything. 4. **Choose the new constraint to describe** Choose the new constraint to describe Choose Add constraints entry under Change to describe, so the proposal covers the whole constraint: when it blocks a configuration and the message people see. 5. **Type the requirement in plain English** Type the requirement in plain English Type the requirement as the team wrote it: block a selected clear panel with a black finish. 6. **Ask for a proposal** Ask for a proposal Ask for a proposal. The AI replies with a question instead of guessing: a constraint needs its own key and the message people see when it blocks a configuration. 7. **Add the details the AI asked for** Add the details the AI asked for Keep the requirement and add the missing details: call the constraint incompatible_panel and show the message "The black frame does not take a clear panel. Choose opaque or remove the panel." 8. **Ask for the complete proposal** Ask for the complete proposal Ask again. The AI now returns a complete constraint. Nothing is saved until you choose to save it. 9. **Read the restatement of the change** Read the restatement of the change Read the restatement. It says in plain words that the proposal adds the constraint incompatible_panel to the FA-300 model: it blocks a configuration that includes a panel when the frame finish is black and the panel type is clear, and shows its message. Every value it saves is listed next. 10. **Check what will be saved** Check what will be saved Read what the constraint will save, field by field: its key, when it applies and its message. Each option is shown by its name in the model. 11. **Check when the constraint applies** Check when the constraint applies Check when the constraint applies, read from the labels the model gives each field: Include a panel equals Yes, Frame finish equals black and Panel type equals clear. 12. **Check the key and the message** Check the key and the message Check the key incompatible_panel and the message people will see: "The black frame does not take a clear panel. Choose opaque or remove the panel." 13. **Confirm you checked the whole proposal** Confirm you checked the whole proposal Confirm that you checked every value. FactorySpec still validates the whole model and checks it against the expected results when it saves. 14. **Save the proposal as a draft** Save the proposal as a draft Save the proposal as a draft. Saving does not approve, release or apply the constraint: a separate engineering expert, the expected results, the proof and an independent review come next. 15. **Request the native engineering review** Request the native engineering review Prepare the native engineering review of the saved draft. A separate engineering expert must approve the model in FactorySpec before it can be selected here. [Watch or practise this chapter](https://help.smartfact.ai/automation/demo?guide=factoryspec-assistance&chapter=assisted-rule&audience=office) Only a draft was saved and its engineering review requested. A separate expert, the expected results, the proof and an independent review come next.