Conclusion
In conclusion, remember that your ability to answer your research question is only as good as the instruments you develop or your data collection procedure. Well-trained and motivated observers or a well-developed survey instrument will better provide you with quality data with which to answer a question or solve a problem. Finally, be aware that reliability is necessary but not sufficient for validity. That is, for something to be valid it must be reliable but it must also measure what it is intended to measure.