Applying the Theory of Planned Behaviour for the Prediction of Handwashing Behaviour of Health Workers Ruhi Selçuk Tabak1, Gül Bülbül Maraş2 , Aynur Esen3 1. Asso. Prof. Dr., Muğla University, School of Health Sciences, Muğla -Turkey firstname.lastname@example.org 2. Research Assistant , Aegean University, School of Nursing, İzmir-Turkey 3. Asso. Prof. Dr., Aegean University, School of Nursing, İzmir-Turkey Background: Health workers have the tendency to abandon their health behaviours which they had adopted in mechanical ways of learning. In order to have health workers to develop and maintain basic health behaviours such as ‘hand washing’ at a high quality, all kinds of educational activities aiming at behaviour modification should be planned and implemented in the frame of certain theories that define the health behaviour change procedures. The theory of Planned Behaviour (TPB), which is one of the basic models, was selected to explain the adoption and practice of hand washing behaviours of health workers. Objectives: The main objectives of this study are; - to develop a scale to measure attitudes, subjective norms, intention and behaviour for prediction the washing behaviours of health workers - to develop and implement a TPB based in-service training program for hand washing behaviours of health workers. Methods: For the first objective of the study, a 46-items likert-type scale with the title ‘Scale for Assessment of Hand Washing Behaviour in the Frame of TPB’ was developed and tested in terms of validity and reliability by applying the scale to 241 health workers in different hospitals. For the second objective, a training course based on TPB for handwashing behaviour was planned for 2 groups (30 person each) of health workers. The scale was applied as the pre-test to all groups including the control group. Results: The coefficiency and consistency of the scale was found to be high (Cronbach’s alpha: 0.79). Accordingly, Gutman Split-half value was estimated 0.79 for the first half and 0.64 for the second. The results of factor analysis tests were also found to be high (Kaiser- Meyer-Olkin:0.72, Barlett’s Test of Sphericity : X2 = 3937,770 p < 0.000). The training course is in progress. Conclusion: The ‘Scale for Assessment of Hand Washing Behaviour in the Frame of TPB’ was found to be reliable and valid and can be used for the educational activities and researches on the hand washing behaviour.