Just be careful about the kinds of "evidence" that is deemed acceptable.

See

     Davies, J. & Macdonald, G. (1998). Quality, Evidence, and Effectiveness In

Health Promotion: Striving For Certainties. London UK: Routledge.

     The following book is available FREE at the URL below.

Evaluation in health promotion:  Principles and perspectives

  Edited by Irving Rootman, Michael Goodstadt, Brian Hyndman, David V. McQueen,
  Louise Potvin, Jane Springett and Erio Ziglio

  WHO Regional Publications
  European Series, No. 92
  2001, xxvi + 533 pages
  ISBN 92 890 1359 1
  Sw.fr. 122.-
  Order No. 1310092

  Policy-makers, professionals of all kinds and the general public increasingly
recognize social and economic
  factors as important determinants of health. Because health promotion
approaches address these factors,
  they can play an increasingly valuable role in protecting and improving
health. At the same time, funding
  sources increasingly demand evidence that initiatives give value for money.
Health promotion initiatives need
  effective evaluation to realize their potential: both to prove their value as
investments and to increase their
  effectiveness in achieving their aims.

http://www.who.dk/eprise/main/WHO/InformationSources/Publications/Catalogue/20010911_43

and

Raphael, D. (2000). The question of evidence in health promotion. Health
Promotion International, 15, 355-367.

dr

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