Within the realm of experimental research, there are three major types of design:
If you choose to conduct experimental research, one of your most important tasks will be to choose the design that gives your research the best combination of internal and external validity. At the same time, it must be practical enough so that you can actually do the research in your own circumstances.
Remember, no particular type is right for all situations. Real-world constraints will often dictate what is practical or possible. In any case you need to be careful to recognize the weaknesses of the design you choose. Do not attempt to prove things or make claims in your findings that are beyond the capabilities of your design.