I would have added some more detail on the four stages of cognitive development as according to Piaget. Also a more detailed outline of Flavell’s (1990) perspective –taking research.

For Zygotsky how about more detail on his ‘zone of proximal development’.

C grade as it stands!

- What about the six sub-stages of the sensorimotor stage in Piagets stages?
- Criticism of Piaget's claims of the sensorimotor stage by Bower & Wishart (1972) could be worth a mention.
- It would also add depth to your study if you outlined one of Piagets tests for any of the stages.

Some discussion of how both theories have contributed to our understanding of the education of young children would be useful.

The comparison you have outlined is competent and just needs a little embellishing to broaden the scope.

Grade C - as it is!

In paragraph one it would be helpful if you gave one or two more definitions of personality to widen the conceptual base.
In paragraph two some more details on types B and C personalities would give the reader more information.
Is there any research worth mentioning on the relationship between extroversion and introversion and stress?
You have stated your aim clearly.
I am not sure that I understand the format of your last 4 paragraphs? Please clarify this!