Too many employees are reactive to their boss - they simply respond to orders and direction. This leads to a lack of mutual understanding, and tasks that don't get done the way the boss intends.
Being proactive, however, can mutually benefit both you and your manager.
It's always better to clarify with a boss. Clarify, in this instance, means making sure you and the boss are on the same page when it comes to tasks, goals and team-building.
A major mistake most managers make is they simply assume their team knows exactly what his or her expectations are. This 'top-down' approach does not work in today's modern workplace.
By asking questions, an employee and manager become more mutually joined; tasks get accomplished quicker and more accurately; and the overall organization improves. It's about communication - two-way communication.
This list of questions, from Careerbuilder via CNN.com, is an excellent way to begin the process.