Is it necessary

Oh, good...
I can't draw pentagrams..
I'd have to look at my amulet the whole time or draw it on a piece of paper..

well you dont need a pentagram in your circle or a huge pentagram on the floor. a simple circle should be ok for most stuff. now if your looking for something with a pentagram i would recommend just printing one off from a computer or something. it wont be big but it would be perfect for some spells and/or alters.

Completely personal decision. I've only really seen circle casting in Wiccan ritual work, honestly.

It is really up to you...

There are also those who visualize a circle and cast it with energy rather than creating a physical circle.

If you believe it is necessary then go a head and do it. It's personal choice.
Also if you want to include a pentagram you can.

Do it specially when you are working with flames or fire. imho

This thread has been moved to Misc Topics from General Info.

A circle is though if recommended to be cast, but it isn't mandatory.
A circle is cast for purposes such as protection during spell casting. To contain any magickal energy raised and to prevent its dissipation until it has been used up is another purpose of a circle.
@Pooja: It is not that you need to cast a circle if you are working with fire, etc. It is completely a personal preferance and is up to the caster if he wishes to cast a circle or not.

I almost certainly cast a circle around my work with representation of the elements even if i am not in it as with ritual witg my god and godess every full moon.