Providing teachers effective professional development (PD) is an ongoing challenge in the field of education. Emergence of technological innovations in the form of computer-based asynchronous and synchronous communication has provided new opportunities to improve and expand teacher PD opportunities beyond the physical walls of a school. The…

This paper reviews meta-analysis procedures and several meta-analysis findings related to science teachings. Several generalizations are offered, one which indicates that instructional techniques which help students focus on learning (preinstructional strategies, increased structure in verbal content of materials, use of concrete objects) are…

Forty-two studies comparing students with access to graphing calculators during instruction to students who did not have access to graphing calculators during instruction are the subject of this meta-analysis. The results on the achievement and attitude levels of students are presented. The studies evaluated cover middle and high school…