This study examines how the achievement of students was affected by using blogs as considered a means of formative assessment, and it also checked the participants' attitudes towards them. Participants (N=60) were divided into two equal groups: experimental and control groups. Instruments include an achievement test based on writing skills and a learner attitudes' scale. Results showed that there were statistically significant differences between the mean score of the experimental and control groups in favor of the experimental group. The study concluded that using blogs as a means of formative assessment proved to be effective in improving freshmen students at the faculty of education writing skills and attitudes towards blogs