～とおり(に)／～どおり — Just As, According To

先生が言ったとおりに書いてください。

Sensei ga itta toori ni kaite kudasai.

Please write it just as the teacher said.

とおりに follows the past verb 言った to mean 'in the way that was said'.

予定どおり、会議は三時に始まった。

Yotei doori, kaigi wa sanji ni hajimatta.

As scheduled, the meeting started at three.

どおり attaches directly to the noun 予定 (rendaku voicing).

この説明書のとおりに組み立てれば大丈夫です。

Kono setsumeisho no toori ni kumitatereba daijoubu desu.

If you assemble it according to this manual, it'll be fine.

の + とおりに connects a noun to mean 'following the manual'.