This, Essentialism by Greg McKeown

The core of essentialism as a concept focuses on the idea that any particular entity requires certain elements for its functioning and existence. These are the essential traits which make an entity what it is. Essentialism is a book which deals with situations wherein people would find themselves in the middle of an information explosion. They could also feel occupied with a lot of work, but still be unproductive. There are times when people follow the notion that they have to do everything, but on the contrary, they end up doing nothing. There is no specific direction to their tasks and neither to their goals. Essentialism as a concept narrows down this notion into doing the right things which are absolutely necessary, in a right manner and at the right time. It is about categorising things as important and unimportant as per one’s personal goals, and doing only the important things.