What does "collected on the outside" mean

Question

Winning Colors® is an assessment tool that is used to classify behaviors into four dominant categories: 

    Planners. Planners are quiet, and introspective. They like to be correct and are very detail oriented. They have excellent listening skills. They are calm, cool, and collected on the outside. They are likely to hide their feelings. 

Answer 1

آنها فقط در ظاهر آرام و خونسرد هستند.

cool, calm, and collected

https://www.dictionary.com/browse/cool--calm--and-collected

Comments

collected را میتونیم بگیم خویشتن دار؟

---

اگر هدف، ترجمه کردن هرسه کلمه باشه، بله. اما این سه کلمه در واقع کلمات یک اصطلاح هستن که معنیش رو عرض کردم.