Evaluating Feasibility, Validity, Reliability and Norm Finding of the Beck’s Self-Concept Questionnaire

Self-concept is a series of attributes, abilities, attitudes and values that individuals believe they are described by them. There is a direct association between positive self-concept and feeling self-validity, inventory, creativity, thought health and mental health of individuals. The differences between self-concept and self-esteem include qualitative feels and judgments of individuals when describe themselves. Self-concept is a psychological concept including emotions, evaluations, attitudes and self-description of individuals. Self-concept is externally defined through personal and behavioral characteristics; although, internally defined through emotion of individuals towards themselves and the world in relationship with others This study evaluated the feasibility, validity, reliability and norm finding of the Beck’s self-concept questionnaire. In total, 707 female students from public high schools of Tehran, Iran were selected by multistage cluster sampling. Participants completed the 25-question questionnaire. Based on the results, four questions were removed and validity coefficient of 21-question questionnaire was 0.786 using the general formula of Cronbach's alpha. For structural reliability, the method of principal components analysis was used. The questionnaire contained six factors. These six factors together explained 50.9% of the total variables variance. For convergent reliability, the Pearson’s correlation coefficient was used between the Beck’ and Rogers’ self-concept questionnaires. There was a positive and significant correlation between the two questionnaires; therefore, the questionnaire had a convergent reliability. Eventually, percentile and subject norm were calculated for the questionnaire.