This best-selling text pioneered the comparison of qualitative, quantitative, and mixed methods research design. For all three approaches, John W. Creswell and new co-author J. David Creswell include a preliminary consideration of philosophical assumptions, key elements of the research process, a review of the literature, an assessment of the use of theory in research applications, and reflections about the importance of writing and ethics in scholarly inquiry.这本畅销书开创了定性、定量和混合研究设计方法的比较研究。对于这三种方法，johnw。克雷斯韦尔和新合著者J。大卫·克雷斯韦尔包括对哲学假设的初步考虑、研究过程的关键要素、对文献的回顾、对理论在研究应用中的应用的评估，以及对写作和伦理在学术研究中的重要性的思考。