This experimental study examined the effectiveness of using the SCAMPER Model in developing the essay writing skills of EFL learners and their attitudes towards using it. The study sample consisted of 64 students enrolled in the English Department, Faculty of Education, Arish University during the first semester of the school year 2018-2019. The ages of the participants ranged from 21 – 22 years old. The training of students on the use of SCAMPER Model on developing their essay writing skills took 28 hours. The participants were pre and post tested. The instruments used in the study included an essay writing scoring rubric and a 24-item attitude measurement. Statistical analysis was used via two statistical programs namely; the SPSS program and Haridy's statistical analysis program H-EESC for the effectiveness and effect size in the educational programs and researches. The study found that the SCAMPER Model has had a large effect upon developing all EFL learners' essay writing skills namely; ideas, organization, word choice, structure, mechanics of writing and editing. Findings also indicate that the respondents' answers to the measurement items show their positive attitudes towards the use of the SCAMPER Model on developing their essay writing skills.