WordNet (r) 3.0 (2006):

position paper
    n 1: a report that explains or justifies or recommends some
         particular policy
    2: a memorandum summarizing the items of an agreement (used
       especially in diplomatic communications) [syn: aide-
       memoire, position paper]

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "position paper":
   affidavit, affirmance, affirmation, allegation, announcement,
   annunciation, assertion, asseveration, averment, avouchment,
   avowal, bulletin board, circular, communique, conclusion, course,
   creed, declaration, deposition, dictum, edict, encyclical,
   enunciation, guiding principles, ipse dixit, line, manifesto,
   notice, notification, plan of action, platform, policy, polity,
   position, positive declaration, predicate, predication, principles,
   procedure, proclamation, profession, program, programma,
   pronouncement, pronunciamento, proposition, protest, protestation,
   public notice, report, say, say-so, saying, solemn declaration,
   stance, stand, statement, statement of belief, ukase, utterance,
   vouch, white book, white paper, word