What to say instead of “It won't happen again”

When to use it

Use it after a mistake, once the immediate fix is done. Describe the specific change you've made to prevent it. A checklist, a reminder or a review step is more convincing than a promise, because it doesn't depend on willpower.

Example

In an email or Slack message

In a follow-up: “To prevent a repeat, I've added a ‘check recipients’ step to our send checklist.” Naming the exact change shows it's real.