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Routine use of subjective scales for pain, agitation, and sedation promotes more effective patient management in order to reach specific end-points. Each subjective sedation scale method should be evaluated in terms of its reliability and validity. The purpose of this study was to fassess the reliability and validity of Richmond Agitation Sedation Scale (RASS) and Ramsay scale. Subjects were 82 (eighty two) patients assessed using RASS and Ramsay sedation scale after receiving analgesia and sedation drug. This study was an observational study with cross sectional descriptive sampling conducted in consecutive patients sampling within a period of 4 months during May–August 2014. The results of the assessment were analyzed using Alpha Cronbach to determine the reliability and Rank Spearman to test the validity. It was revealed that RASS scale had the highest reliability value with Alpha Cronbach (α):0.951 and the highest validity with Rank Spearman (rs):0.743 while the highest reliablity value achieved using the Ramsay scale was Alpha Cronbach (α):0.921 with Rank Spearman (rs): 0.922 as the highest validity score. It is concluded, therefore, that the RASS scale shows higher reliability and validity coefficients than the Ramsay scale.