In a number of threads here, the idea of alignment has in my view been misinterpreted, in particular, Lawful, and Evil. Thus, I have decided to "reprint" part of an original article from the Dragon magazine ( Dragon, 1979, p23) in which guidelines are given - in game terms - for the role play of each of the nine ADnD alignments. As the author (Carl
Parlagreco) states, the guidelines are not always absolutes, but are a set of *guides* to the meaning of words like Lawful, and so on. I pass these guidelines out to all players in my campaign(s) and expect them to be followed as closely as possible: that is, I judge their  alignments (in part) by how they behave in the situations covered in the guide. Hope it is useful to you as well.

LAWFUL GOOD Will keep their word if they give it
  Would not attack an unarmed foe
  Will not use poison
  Will help those in need               
  Prefers to work with others
  Responds well to higher authority    
  Trustful of organizations

LAWFUL NEUTRAL Will keep their word if they give it
  May attack an unarmed foe
  May use poison
  May help those in need
  Prefers to work with others
  Responds well to authority
  Trustful of organizations

LAWFUL EVIL Will keep their word if they give it
  Would attack an unarmed foe
  Will use poison
  Will not help those in need
  Prefers to work with others
  Responds well to higher authority
  Trustful of organizations

NEUTRAL GOOD Will keep thier word to others of good alignment
  Would not attack an unarmed foe
  Will not use poison
  Will help others in need
  May work with others
  Indifferent to higher authoritye
  Indifferent to organizations

TRUE NEUTRAL Will keep their workd if in their best interst
  May attack an unarmed foe
  May use poison
  May help those in need
  May work with others
  Indifferent to authority
  Indifferent to organizations

NEUTRAL EVIL Will not necessarily keep their word
  Would attack an unarmed foe
  Will use poison
  Will not help those in need
  May work with others
  Indifferent to higher authority
  Indifferent to organizations

CHAOTIC GOOD Will keep their word to others of good alignment
  would not attack an unarmed fore
  Will not use poison
  Will help those in need
  Prefers to work alone
  Responds poorly to higher authority
  Distrustful of organizations

CHAOTIC NEUTRAL Will keep their word if in their best interest
  May atack an unarmed foe
  May use poison
  May help those in need
  Prefers to work alone
  Responds poorly to higher authority
  Distrustful of organizations

CHAOTIC EVIL Will not necessarily keep their word
  Would attack an unarmed foe
  Will use poison
  Will not help those in need
  Prefers to work alone
  Presponds poorly to higher authority
  Distrustful of organizations
Poisons
DM Misc.
Bard Stuff
D20 RPG WIZARDS
A Bit About Alignments in Dungeons & Dragons