Prepare your computer...
Clean up the desktop, remove distracting wallpaper
Decide what you want to capture and resize windows if necessary
Close unnecessary windows
Prepare the screens, examples and files you want to use
Turn off distractions such as message popups, notifications, etc

Prepare your physical environment...
Find a quiet spot to record
Avoid rustling papers, squeaking chairs, barking dogs, passing traffic, etc
Use a good desktop microphone, or headset/mic set if possible
If you include video of yourself, check for good lighting, framing, etc

Prepare yourself...
Design the lesson you plan to give
Think about what you will say and how you will say it
Keep it short, sharp and to the point
Your lesson should be as long as it needs to be, but no longer!
Use a script if you feel you need one
Rehearse, rehearse, rehearse!

Now go!
Speak clearly and articulate your words
Find a speech rate that works for you, not too fast, but not too slow
Describe what you're doing on screen and match your descriptions to your actions
Keep your mouse still unless you're actually doing something with it
Be yourself!
Be prepared to do a couple of takes! It's rare to get it right first go
watch your screencast back and evaluate your effort. if you think you can do better, do it again!

Resolve a problem with your group while recording a screencast (this will capture the group conversation and problem solving) Make sure all group members can answer the problem. The teacher will identify the spokesperson for the group by selecting a number. The spokesperson will be asked to verbalize their groups strategy for solving the problem.