INTRODUCTION : Experimental investigation is one of the corner stone's of scientific study which is why many educational establishments have science labs. However, an experiment alone is quite useless without accompanying written reports for explanation, verification and hypothesis. For instance, what use would it be conducting an experiment in which you measured the time taken for a 100 g apple to fall 3.2 m from the top of a tree to the ground once? Even if you did write up this experiment in detail, it is unlikely that your conclusions would cause any excitement. But if your experiment was repeated many times for different masses of apples and different heights of trees; and your report included details of method, errors and observations; and the data was appropriately presented; your experiment would begin to have some scientific value. This unit will show that there are many concepts to be understood, apart from communication, when reporting experimental results. Accuracy, honesty and clarity of presentation are all important in determining the validity of a scientific experiment. We will be considering the implications of all these aspects in this unit.