This research was a two-year developmental research that has resulted in validated teaching materials. The second-year of the research purposed to develop instructional evaluation materials, which can help to improve the quality of student learning outcomes. The teaching materials were used for elementary school student teachers at Universitas Sebelas Maret Surakarta Indonesia. Content validity of the developed materials was further assessed and ensured by an expert. These materials were contextually implemented in their classes to measure their effectiveness levels. Through a quasi-experimental research methodology, one control group and one experimental group were selected for the sample of the study. Data revealed an increase in the experimental group's learning outcomes of evaluation subjects as compared with the control group. This showed the effectiveness of instructional evaluation materials. The results of paired-samples t test (t-count value = 3.457 and t-tab = 1.980) rejected Ho. The results indicated that there was a significant difference between the experimental and control groups' mean scores of posttest. The current study concludes that the teaching materials have resulted in more effective results.