Narrow it by halves, with a number before and after

Step 245 minutes, plus one real run to measure again

Included in Membership

This step is included in Membership.

Every Academy track is part of the one membership, together with the whole Vault library.

Step one of this track is open to everyone, in full.Write the symptom down before you touch anything

What this step installs

You finish this step with the fault pinned to one link in the chain, a before-number and an after-number measured the same way, and a note of every test that got you there.

45 minutes, plus one real run to measure again

It hands off to Operations in the Vault, which the same membership opens.The track list stays open to anyone.

Included in Membership — £79/month.

See MembershipBack to When it breaks, find out why

You sign in first, so the membership lands on the right account.

Your ticks in this browser stay. They come with you when you join.