Please answer as simply as possible avoiding jargon.

How often have you seen it on a job posting? "Must be able to multi-task effectively" or "Must be able to operate effectively in a multi-tasking environment" - have you seen those? What is your opinion about multi-tasking? The whole concept of critical chain starts from the premise that multi-tasking is not only bad - it can't be done. The concept of Kanban, one Agile methodology based on workflow, purposely limits "work in progress" - WIP - in order to focus.