In any project, there are always several types of personalities involved during its lifetime.

You may say "I know someone who finished a project alone".

Its good you said that. In that case, there is no team involved but different personalities of the project implementor have been used. At the project concept stage, he is acting as an engineer, then a procurement officer to purchase the materials and equipment for his project, the trades person during installation, the project manager to determine if the project is on schedule and on budget, the inspector do self-check on his job and the client to accept the project that has been completed.

This scenario is very common in domestic projects such as an expansion or renovation of an existing house. In larger scale however, the different personalities performed by this single inidividual in our example need to be executed by different people. there may even be several people implementing a single tasks.

There may be a possibility of assuming several positions but there may be some danger of not having a check and balance.

Each resource irregardless of how small its involvement in the actual project implementation is a necessity. A good example of this may be the mail courier. If this person will not be performing well, the mails or documents may not be reaching its destination on time or the right receiver causing delay of project execution.

In any project implementation team effort and cooperation is very essential for its succesful delivery to the client satisfaction.