conceptualize validity and reliability

  Compare and contrast how the case study researchers (i.e., Mitchell & Bernauer; Collier et al.) from this week's readings conceptualize validity and reliability to how the other researchers (i.e., Creswell & Miller; Golafshani) from this week's reading conceptualize reliability and validity. Why might there be differences in conceptualizations? Is one way of thinking about reliability and validity inherently better than another? Why or why not?