diff --git a/content/co-teaching.md b/content/co-teaching.md
index 4557b24..ab24451 100644
--- a/content/co-teaching.md
+++ b/content/co-teaching.md
@@ -11,8 +11,42 @@
 - Exercises: ? min
 :::
 
+Why teach together?
+-------------------
 
-Here the episode sections and text ...
+It has been said **a lot**, especially in areas such as code development or scientific research, about the value of collaboration.
+Yet still today, the effort of teaching is made alone far too often: a person decides to share their knowledge (or gets assigned a study module) and starts building the actual teaching material basically from scratch.
+It seems much more logical, in the age of FAIR science and open knowledge, to release, develop, iterate, and maintain teaching material -- including the contact sessions -- **collaboratively** as well.
+
+Ways to teach together
+----------------------
+
+* Develop materials together - avoid duplication.
+* Present the materials together ("proper" co-teaching, see [Team teaching section](https://coderefinery.github.io/manuals/team-teaching/) on the CR manual).
+* Use helpers extensively to tackle specific tasks commonly arising in online teaching process.
+* Involve your learners too, e.g. using collaborative document (such as HackMD) for parallel and mass answers.
+
+Advantages
+----------
+
+* If you need to teach anyway, combined efforts take up less time.
+* More engaging to the audience, taking some of the (sometimes daunting) expectation to "speak up" off of the students.
+* Easier on-boarding of new instructors -- one of them can be learning at the same time, either subtleties of the material or the teaching itself.
+* [Swiss-cheese](https://en.wikipedia.org/wiki/Swiss_cheese_model) principle: two "imperfect" teachers are __much__ easier to find and complement each other than the extensively-prepared, absolute expert.
+
+Challenges
+----------
+
+* Additional effort needed of teacher and/or helper coordination -- including syncing up their schedules!
+* Materials might need to be (hopefully slightly) tuned to a specific target audience.
+* Using simultaneous-teaching strategies is a learned skill, not identical to the classical lecturing.
+* Online tools (HackMD, type-alongs) can potentially overload learners and teachers alike, if not used with care.
+
+:::{exercise}
+(What's better here -- practical exercise or discussion?)
+:::
+
+(TODO: Here goes the rest of the episode sections and text)
 
 
 :::{keypoints}