This research was done aimed to investigation the effective factors on production skills of tobacco growers in Mazandaran province. This is an applied study based on descriptive-correlation method. Statistical population of this research consisted of 1500 tobacco growers  of Mazandaran province, and 306 people were selected based on Morgan table. Content validity of the questionnaire was determ...

The study of individual and social factors affecting the tendency to verbal violence among high school boy’s students in Bushehr city. The methodology of this study was survey and used a questionnaire. Population of this study was all high school boys’ students in the city of Bushehr and 400 persons determined as the sample size with using Lin table. The method of sampling was a multi-stage str...