1. IntroductionIn society, demanding the development of the youth, teachers’ job performance both inside and outside the classroom is essential to fulfilling this demand. Teachers can influence the learning process to some significant extent. Teachers are expected to be role models for their students and, therefore, teachers’ job performance is crucial for students’ success. Teachers will normally be satisfied with their job if teachers have a good relationship with the principal(s) of their school, are offered the highest possible salaries, and are involved in the decision-making process at their school, they will normally be satisfied with their job. Job satisfaction is an important facet of people's lives and their productivity in the workplace. Job satisfaction can lead to a sense of responsibility and involvement toward achieving comprehensive career goals and contributing to the productivity of an organization (Harter, James, Schmidt, Hayes, & Theodore, 2002, cited in Ismail, 2012).Robbins states, "job satisfaction refers to the individual's general attitude towards his or her job. He adds that "a person with a high level of job satisfaction holds positive attitudes about the job, while a person who is dissatisfied with his or her job holds negative attitudes about the job" (Robbins, 2003, cited in Younes, 2012). A principal’s leadership style might affect teachers’ job satisfaction. Teachers’ job satisfaction could improve their performance in the classroom (Nadarasa & Thuraisingam, 2014). Teacher job satisfaction is a "...vital area of study since several studies have found that work satisfaction influences general life satisfaction. General life is an important influence on the daily psychological health of a teacher." This, in turn, has an impact on teachers’ job performance (Andrew and Whitney, 1974, cited in Wangai, 2012).Teacher job satisfaction is a source of motivation that sustains effort in performing tasks required of good teachers (Watson et al., 1991, cited in Wangai, 2012). Effort results in higher performance when employees clearly understand and are comfortable with their roles (Kreitner, 1986, cited in Gathungu & Wachira, 2013). If a teacher is incompetent, dissatisfied with his jobs, and not guided by proper values, the entire edifice of the education system will be shaky (Raza, 2010). Due to better performance shown by satisfied workers, it is the top priority of all organizations to achieve the desired goals by increasing their satisfaction (Chambers, 1999, cited in Iqbal & Akhtar, 2008). In this point of view, examining the relationship between teachers’ job performance and satisfaction is crucially important for promoting a better job performance in the future.
An Application of Moderation Analysis: the Situation of School Size in the Relationship among Principal's Leadership Style, Decision Making Style, and Teacher Job Satisfaction