Occasion when you have worked as a part of team?

Yes. and successfully. Requirements include: communication, clear and concise goals, sufficient supplies and resources, a unified direction and purpose, and an appropriate time line.

failures in "team" theory involve a lack of any of the above, or the inability to acknowledge a predisposition to failure as this is also part of the mindset within some companies or organizations.

The choice involves willingness to participate, honest and forthright outcome expectation by all parties involved coupled with true and obtainable objectives.

teams exist in relationships, working groups, and personal life considerations.