DQ The theoretical foundations of qualitative and quantitative methods are very different, but many researchers believe both methods should be used in the research study to increase validity and reliability Grand Canyon University DQ: The theoretical foundations of qualitative and quantitative methods are very different, but many researchers believe both methods should be used in … Continue reading DQ: The theoretical foundations of qualitative and quantitative methods are very different, but many researchers believe both methods should be used in the research study to increase validity and reliability