A perfectly crafted task list is useless if you don't communicate it. Continuing with the above example, we need to communicate with the material supplier so that we can schedule other tasks, and we may need to communicate with our friend so they know what they are supposed to do and when. We may also need to communicate with our neighbors so that they are aware of our building work. Communication naturally involves the review activity, because while talking to our friend we can adjust our task list if they can't make it on a certain day, or while informing the neighbors of our plans additional tasks—such as obtaining planning permission—may become apparent.
Exercising task management and communication provides us with enough to manage most projects, without a Gantt chart in sight!