Maryam Salamat Ahvazi - Department of Education, Dezfoul Branch , Islamic Azad University, Dezfoul, Iran.
Faranak Omidian - Assistant Professor, Department of Education, Dezfoul Branch , Islamic Azad University, Dezfoul, Iran.

The aim of this study is to evaluate the effect of in-service courses on staffs’ skills of Shahid Tondgooyan petrochemical company based on Halton model. The present study is applied in terms of purpose and is quasi-experimental in terms of data collection. In this study, a researcher made test as pre-test and post-test and a researcher made questionnaire were used. To test the research questions, single-group T- test and chi-square were used. Validity of questions was obtained using the Pearson correlation method and reliability was used using the Cronbach's coefficient alpha. According to Morgan table, 201 subjects were to be elected for a total of 420 employees participated in courses. But in order to prevent the loss, 220 employees were randomly selected and finally 202 questionnaires and tests were collected. The findings of this study with regard to the statistical analysis showed that the effect of in-service courses of staff skills of Shahid Tondgooyan petrochemical company based on Halton model was effective on increasing the staffs’ skills.

Evaluation, effectiveness, staffs’ in-service courses, Halton evaluation model