Sentence:  Tasks may be taken from the overburdened and given to the <WSD>underburdened</WSD>; certain tasks may be shared; some additional (new) tasks may be assigned the <WSD>underburdened</WSD>; perhaps employees who are overburdened can have some of their tasks simplified, combined with others, or outright eliminated. 
Meaning of the word marked with <WSD> tags:  Not having sufficient work.