Grouping in Guild Wars is a large part of the game. You group up in both PvP, and PvE for most of the game. This guide will cover grouping basics, some etiquette, and strategy.
Forming a group is easy. To form a group, simply select another character and press the green button on the right of the screen in the party window. You can also type in their name here which is very useful in a crowded outpost. It is very good etiquette to not randomly invite people. Invite people who are looking for a group (LFG) or people you ask and accept your invitation. A lot of people don't like it when they are invited without being asked first.
The group size is different for different areas. You can have a max of 4 people in a group in post-searing Ascalon. You can have a max of 6 starting in the Shiverpeak Mountains, and 8 much later in the game and in the Tombs of the Primeval Kings.
A good group is a balanced group. Each profession brings something to the group. Don't assume each profession can only do one thing. For example, not all monks are healers; some of them could be a very well built smiting monk that hurts the enemy instead of healing their team. Ask the people you invite what they are built for.
When grouping with other players remember everyone is working for the same goal. Sometimes it gets stressful on a challenging mission. Remember it is just a game so there is no reason to get worked up and yell at other players. You don't even lose XP or your items if you die or fail a mission, unlike other games.
The most important thing to any group's success is communication. That is the key to a good group. If everyone knows what to do and what is going on the group runs smoothly. Guild Wars makes communication easy. You can Ctrl click on just about anything on the UI and inform your team of it. For example you can Ctrl click on your energy and it informs your group how much you currently have, or you can click on a condition you're effected by to tell them about that condition. Ctrl double click on a mob (or you can Ctrl + space or ctrl + shift + space) to call it out to the group. Your team can then press T to target the mob and begin to attack it. Target calling is important as it allows your group to focus fire on a single target. Focus firing is a tactic where everyone puts their entire effort into killing one target so then there are less targets to deal with and thus less damage output and survivability. Having a designated target caller helps a lot to strategically take out the enemy. For example, focus firing on enemy healers first takes out their support to heal their team and so the rest of the team will fall easier, or on a mesmer to ensure your healers are able to heal.
You can also draw on the radar and ping it. When used correctly it is a great feature. Use it for giving directions, formations, tricky areas in missions, or whatever else you can think of. Along with this, sticking together in general is advisable. Most times when someone goes it alone on a group they end up dieing and costing the group. Healers only have a limited range, and if someone goes out of that range they won't be able to be healed. Furthermore, the healer trying to heal the person will start to run towards the person until he is in range. It gets nasty if your group isn't coordinated.
Another group tactic which only works in PvE is pulling. Pulling is using a ranged attack to pull out one mob from a group of mobs. This tactic is used when taking on the entire group at once would be suicidal. A ranged attack is used because getting up close will agro the whole group. The puller brings the mob to the group who is positioned a safe distance away from the enemy group of mobs. Some mobs are friendly, which means other mobs of the same type will assist them, and on some missions the ranges of how far they will go to assist can be large.
Update: The last patch removed any usefulness of the ctrl+shift+space default hotkey. It used to add on "Press T to target" but now is basicly the same as ctrl+space (or ctrl double-click) default. Only differences is calling out I'm targeting X and I'm attacking X which pressing T(default) will still target the last person called using either method. (not sure if the change is intentional)
Well that's it for this guide. I hope you found it informative and helpful. The most important factor to a group's success is working together. Well, I'll see you in Guild Wars.
*** This article was written by Rising_Storm and because it is great guide that shows how to make a party, I posted it here. :)