This means that as more people use the system it can still function
as if less people are using it Its not the most nessesary as you could wait to do your task at a different time but they may decide its not worth it to come back.This nfr is that the user should be able to do complete all tasks while there are 100 users
accessibility
privacy
Privacy is important as the people who you give your data to may not be qualified to store it safely this is why users should be able to request to have their data removed (If they are not actively in a group)
performance
Performance refers to how much computing power/time it takes to complete a task This nfr is when the user applies to join a group they should be told the result of their application within 10 seconds