Picture the moment in a live lesson when a student's answer is almost right. They have the right idea but the wrong sign, or the diagram is nearly finished but one arrow points backwards. What you want is to put a pen on their work and fix it together, in front of the group. Screen sharing gives you a flat picture of that work and a marker that floats above it. A shared whiteboard gives you the work itself, with everyone standing around the same page. That difference sounds small until you have taught thirty lessons with each. It changes how students behave, how much you can see, and how much of the lesson you spend clicking between windows.
Two tools, two different promises
Screen sharing is a broadcast. You show your screen, students watch, and when you stop sharing they are back in the meeting grid. Everything they see is a copy of what is on your computer, and nothing they do touches it.
An online whiteboard is a shared workspace. The page belongs to no one in particular. You and your students can write on it at the same time, and what is left at the end of the lesson is a record of the work rather than a memory of it.
Both are useful. The mistake is treating them as two ways of doing the same thing. They are not. One is good at delivering content exactly as it looks on your machine. The other is good at getting other people to work in front of you.
Annotation: showing versus marking up
Most meeting tools let you draw over a shared screen, and for quick pointing it is fine. Underline a line of a poem, circle a number, draw a quick arrow on a slide. But annotation on a screen share is a layer on top of something else. Scroll the page and the ink stays where it was. Open a menu and the marks hang over it. Change the window size and the whole drawing shifts. If you forget to clear it, the next slide arrives with the previous lesson's scribbles on it.
On a whiteboard the page is the canvas. Ink is part of the content, so it moves with what it belongs to, and it stays there for the student who opens the board later. That makes a real difference for anything sequential:
- Solving an equation step by step in one column while a student solves a parallel one beside it.
- Labelling a diagram together, with each student adding one part and the group correcting the wrong ones.
- Editing a paragraph of student writing, where the crossed-out words need to remain visible so the reasoning stays visible too.
- Building a mind map from class suggestions, adding branches live as they come.
A small habit worth adopting: you write in one colour, students write in another. At a glance you can see who contributed what, and it makes you more honest about how much of the board you filled in yourself.
Engagement: hands up versus hands on
Screen sharing puts students in watching mode, and watching mode is comfortable. Cameras drift off, tabs open, and a student who is lost can stay lost quietly for twenty minutes without anyone noticing. Asking "does that make sense?" rarely fixes it, because the honest answer takes courage.
A whiteboard changes the question. Instead of asking whether they understood, you ask them to show you. Give a class of twenty a three-minute task split across named frames on the board and you can see, without a word, who has started, who has written something wrong, and who has written nothing at all. You can walk the board the way you would walk between desks.
It also changes the pace. Students who would never speak up in a full-group call will happily type a sticky note or draw a quick answer. The quieter contributions arrive without an audience, which is often exactly what a hesitant student needs.
There is a cost, though. A board full of collaborators is also a board full of distractions, and the freedom that helps one student can derail a lesson for everyone else. Which brings us to the part people underestimate.
Control: who holds the pen, and who holds the room
Screen sharing is almost impossible to get wrong. You share, you stop sharing, that is the whole system. With a group of eight-year-olds or a class of adults who are new to the software, that simplicity is worth a lot.
Collaborative boards need rules, or they turn into a cursor stampede. Two students write on top of each other, someone deletes the frame you were about to discuss, and a helpful student starts tidying the board mid-explanation. None of this is a flaw in the tool. It is a classroom management problem wearing new clothes.
Before the first collaborative lesson, decide these things:
- Which frames are open for students to write on, and which are read-only for you.
- Whether students can move or delete objects, or only draw.
- How many people write at once — sometimes pairs on one frame works better than a whole class on one page.
- What the reset looks like when something goes wrong, so you can fix it in seconds rather than apologising for a minute.
Then say the rules out loud, once, at the start. "Blue frame is yours, everything else is mine. If you delete something, tell me." That single sentence prevents most of the chaos people blame on the software.
When screen sharing is simply better
Honesty matters here, because a shared board is not always the right answer. Screen sharing wins when the content has to be exact and interactive: walking through a spreadsheet formula, demonstrating a piece of software, showing a website, playing a short clip with sound, or reading a document together line by line. It also wins on reliability. It asks less of a student's device and connection, which matters when half the group is on a phone.
For pure lecture with a lot of fixed material and little student output, screen sharing is also the lower-effort choice, and lower effort is sometimes correct. Do not build a collaborative activity for a ten-minute announcement.
A rhythm that uses both
The strongest live lessons tend to alternate rather than choose. Use the board as the spine of the session and screen sharing as a temporary window into something specific.
- Open the board before students arrive, with the starter task already visible. No dead time while you set up.
- Share your screen only for the segment that needs pixel accuracy, then return to the board.
- Hand a frame to students for the practice phase, in pairs rather than as a whole group.
- Pull the group back together, review two or three student frames on the board, and name what is good about them.
- Export or share the finished board at the end, so the lesson survives after the call closes.
One practical tip: keep a running "parking" frame for questions you cannot answer immediately. It stops a good discussion from derailing the plan and shows students that their questions were not dropped.
Try it on one lesson segment
You do not need to rebuild your course. Pick a single segment next week — the worked example, the group task, the review at the end — and run it on a board instead of a shared screen. Watch where your attention goes. If you spend the segment looking at your own content, screen sharing was probably enough. If you spend it looking at what students are producing and adjusting in response, you have found the part of the lesson that belongs on a whiteboard.
Ask the group afterwards which version helped them follow the work. Their answer will be more useful than any general rule, because it is about your subject, your students, and the way you actually teach.