Whenever I ask the children to do an ICT task over several lessons (e.g. create a presentation, design an e-book, make a tri-fold leaflet etc.), I often find it useful to include some time for peer-assessment when the children have the chance to view somebody else's work and evaluate it.
If the project spanned two lessons, I would probably do the peer-assessment about a third of the way through the second lesson - this gives the children enough time to have completed a good proportion of the task for a peer to look at but crucially also gives them some time afterwards to modify their work in response to some of thise feedback they are given.
At my school we use the 'two stars and a wish' criteria whereby the children praise two things that have been done well and give one suggestion on how the work could be improved.
During the last academic year, I had great success with creating skills checklists for children to track their progress on during a project and to act as a prompt when they peer-assessed somebody's work.
When it came to the time for this peer-assessment, I would simply ask the children to leave their checklist (with space for peer-assessment at the bottom) on the table next to their laptop (left open with their work), walk to somebody else's computer on a different table and write down their 'two stars and wish' comments on that persons checklist before then returning to their place to read their feedback. This strategy worked extremely well because: only the children were moving (no papers), the children had to view the ICT work from its current state (i.e. they weren't going to the person on the next seat whose work they'd likely obsevered developing) and the skills checklist gave them a clear space for writing their comments in (i.e. it wasn't done on scrap paper or squashed into a tiny space in a draft book).
It's only a simple strategy that takes up five minutes of lesson time but its one that I've found the children really respond well to as it helps them compare their work to others and begin to appreciate what is needed to demonstrate 'super' ICT capability.
As an example, here's a checklist I've created next year for Year 5/6 for using the Keynote iOS app to create an on-screen presentation: