Aries is the first sign of the zodiac, and as such the most dynamic. For this reason, they can be very important members of any team, full of initiative and "get up and go" which will spur on other members of the team. They do, however, have a tendency to run out of steam and thus not finish what they start, and may need other more reliable members of the team to pick up the pieces after them! And be warned, two Arians can be a bit too much for one team...
Taurus (April 22 - May 21)
Earth, Fixed
Taureans are steady, dependable types that can usually be relied upon as a valuable member of any team. While not as outgoing as some other signs, they are often ambitious and think highly of their social standing. Their main weakness is a stubborn streak, so other team members may have to do some serious cajoling or flattering to get their Taurean colleague to come round to their, or the team's, way of thinking...
Gemini (May 22 - June 21)
Air, Mutable
Geminians can be a breath of fresh air - outgoing and quick-witted they can be a useful source of ideas and inspiration for other, less capricious, members of a team. Their mutable nature means they will fit in and adapt to the team structure. The downside is that they have a very low boredom threshold and so lose interest quickly. They can also be fickle, and get involved only in things that interest them, as opposed to working towards the team goal...
Cancer (June 22 - July 21)
Water, Cardinal
Cancerians are often said to be the most emotional sign of the zodiac, but as a Cardinal sign they also possess leadership qualities and ambition. Within a team, they may often be an essential background worker, conscientiously making sure that the team's efforts are running smoothly. Other members should just be aware that Cancerians can be prone to moodiness - don't take it personally if they're having a bad day...