The methods and materials section tells your reader 'how' you carried out the testing or experiments that were part of your research. It may have sections that explain:
WHEN the study was carried out
WHERE the study carried out
what MATERIALS were used in the study, and
HOW the study was carried out / WHAT procedures were used
This last point might include issues such as the statistics that were used to analyse data. Remember that a materials and methods section should not present any other information: it should not have results or discussion elements mixed in with the description of materials and methods.
Find out more about Materials and Methods Sections (PDF file)