This module introduces you to the basic concept of what is meant by a variable, how to describe variables (descriptive statistics) and how to understand the interaction between variables (analytic statistics). You will also understand how to design an Excel sheet that is compatible with statistical software packages. Finally, in the lecture on “How to interact with a biostatistician” you will understand how to involve a biostatistician at various levels of your study and how to extract the best out of this interaction.