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Huong has produced a report that demonstrates thorough knowledge and understanding of experimental design. A high level of competence in planning, conducting and reporting a controlled investigation is evident. Huong has identified variables that need to be controlled in the investigation and there is some evidence of both replication and repetition in the method described. The different aspects of the report have been thoroughly addressed but the labelling of the table and graph could be clearer. Underlying scientific principles have been identified and the suggestions for improving the experimental design imply high-level evaluation skills. Huong has attempted to relate the conclusion to the aim, but the results do not fully support this. This work sample demonstrates characteristics of work typically produced by a student performing at grade B standard.