How to implement sequential task completion
2 answers
Well RTC support many ways to modeling this, since it is a broad context. You can implement an extension, model as aprovals or even with work item states.
Try to be more specific, so we can give a better help!
Comments
A work item save advisor could do this. Examples, start here: https://rsjazz.wordpress.com/2014/05/26/only-owner-can-close-workitem-advisor/
You would need a specific relationship or some other information to determine the order.
I honestly think that there is something wrong with the work culture it you have to enforce something like this though.