available resources a task will suffer due to interference. Task-specific theory states that two tasks will interfere with each other only if the two tasks are similar hence pulling from the same source. If the tasks are different, using different cognitive abilities i.e. Spatial vs. verbal, then divided attention will be easy because the two processes take place in different regions of the brain hence pulling from two resource pools rather than just one which in turn explains divided attention. Many studies prove this to be true and all conclude the degree of interference depends on the nature of the tasks being performed.
             Working memory has its limitations and divided attention can only be so "divided". Cognitive processes take effort and there is some times a tie up on the neurological super highway because of the time required to put forth that effort. The way our brain deals with these little tie-ups is a response-selector. A response-selector can only deal with on thing at a time, just like a waiter can only take one person's order at a time. If two consecutive tasks require the response-selector one ends up waiting while the selector deals with the other task. Most tasks do not require a constant aid of the response-selector so you may select and then initiate an action and the time you spend carrying out that action frees up the response-selector to take on another task, come up with a solution and then initiate the response for that task. This process is a cycle where response-selector bounces from task to task this is commonly referred to as time-sharing and is evidence that divided attention is a
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