# Create a Validation Strategy *** Each qualification, skill set, or accredited course on your scope needs a validation strategy. This defines which units you'll sample when validating. *** ## Before You Start * Sync your scope from Training.Gov so units are available to select * [Set risk levels](/help/validation-strategy-risk-levels) for your units first — this helps you build an effective, risk-based strategy *** ## Adding Units
1
Go to [**Scope**](https://app.rtosafe.com.au/Scope) and open the qualification, skill set, or accredited course you want to set up.
2
Click **Validation Strategy**, then **Modify Units**.
3
Select the units you want to include in your validation sampling. Use **Select All** or click individual rows.
4
Enter your **Selection Rationale** — explain why you chose these specific units (e.g., high-risk areas, core competencies, delivery volume, recent changes). This field is required.
5
Click **Save Changes**.
*** ## What Happens Next * Selected units appear on the Validation Strategy page * You can now schedule validations for these units * Units marked as **Core** are flagged automatically based on Training.Gov data *** ## Common Issues
No units available to select Check that the parent item has child units on your scope — sync with Training.Gov if needed
Can't save changes The Selection Rationale field requires at least 30 characters
Units missing from the list Only units that are on your active scope can be selected