Steve Jobs created a system that allowed everyone to do their best work. In meetings, he would make an action list, and for each action, he defined a Directly Responsible Individual (DRI). They had full responsibility for accomplishing the task.
How to delegate effectively:
Delegate to the right person.
Make sure he or she has the skills to accomplish the task.
Provide clear instructions.
Make your instructions as specific as possible.
Provide clear information on the desired task results.
Ask if any clarification is needed.