[ky3]

> If you are skipping a step in the procedure, aren't you also possibly going to skip writing a step down?

Exactly, so when she reviewed the notebook, she caught the error.

Even if she made a slip in the notebook, merely reviewing it helps jog the memory to revisit and replay what she did in the lab. It's the power of touchstones.

> What if you have to do several steps rather quickly? Say adding a particular chemical, then waiting for ten seconds and adding, another chemical? Do you have time to write it down?

The notebook doesn't always have to operate as a log. It can also operate as a plan of action.