Discuss about the characteristics and  requirements that research tools

 Discuss about the characteristics and  requirements that research tools should have on quantitative research to give validity to the study. Give some examples 

All your posting should be three paragraphs with three sentences.  

All your entries should be done on separate days. For example, First entry on Monday (due on Wednesdays), the first response on Thursday, and the second response on Saturday (Both responses due on Sundays). 

All your entries should have reference and citation.