Qualitative and quantitative methods were used by Kutnick and Kington in this research. For quantitative method, it involved quasi-experimental design. The purposes of the design are to assess paired performance on SRTs as well as to compare their performance based on friendship and acquaintance, gender and ability. Besides that, cognitive task was involved in this research. To encourage students’ participation, the task has to be difficult to analyse, understand or solve. It also must allow the partners to take a variety of point of view and present the tasks as a problem. Furthermore, the tasks must upon science tasks because as said by Howe & Tolmic (2003), “they involve reasoning in a number of cognitive areas (e.g. substance, quantity, proportionality)”. NFER (1979) also stated that “Age appropriate tasks were selected and piloted from the banks of SRTs for the three Years levels”. Actual tasks used in this study included SRT1 (prediction of water level in a tilted jar; perspective-based drawing and prediction of direction of a plumb line in a container when tilted); and SRT2 (volume and heaviness, conservation of matter, and floating and sinking).For qualitative method, it involved interview which had done after students completed the tasks individually. The interview was focused on activities the students involved with friends and examples of the activities that they shared inside and outside school. During the interview, there were some questions that had been asked to them. The questions included the qualities of best friends, classroom and school activities undertaken with friends and activities undertaken with friends outside the school.