From the results of observation and research also found the fact of social constructivism. This can be seen by the existence of social interaction-interaction during the process of teaching and learning that is doing practical work, filling LKPD and discussion. From Vygotsky's theory we can research in learning that places emphasis on three principles, namely as follows: 1). The nearest developments according to Vygotsky, abbreviated ZPD (zone of proximal development) that the actual level of development among regions and levels of development of individual potential. It can be seen from the researcher who provided the material in accordance with the level of ability and provide the level of development of study in collaboration with a group of friends is more capable or gotten guidance from researchers. 2). cognitive Pemagangan. This can be seen when the group learning process where learners are less guided by clever clever. I need to know is here, at the time of break-out group of researchers had previously split the group based on the results of his studies in which one group each have members who are clever and less clever to be able to help each other. On cognitive pemagangan is also, gives some aid deemed still hard done by learners. 3.) Scaffolding. This can be seen when the researchers gave some instructions or guidelines in doing practical work, the steps or procedures in filling LKPD and some things that are still considered difficult by learners
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