Mid-Range Theory Theory's responsibility is to provide nurses with standards that strengthen practice, and for the future understanding and delivery of nursing care. Basically, it provides nursing professionals with a proven way of thinking on how to handle certain situations with proven results. The importance of nursing theories for nursing research is that the knowledge offered gives nurses the foundation to communicate with others and best practices. According to McEwen & Wills (2011, p. 35), mid-range theories are theories that have concrete concepts, are specific, incorporate a measured number of real-world concepts and features, and are tested for accuracy . The development of theories regarding postpartum psychosis, postpartum depression, and motherhood blues is grounded theory, which is a process of theory identification that allows the researcher to obtain the information necessary to explain the characteristics general understanding of a problem, while establishing a theory. Beck began by reviewing the existing literature on the motherhood blues. Reflection on the characteristics of postmodern philosophy of science. Beck believed, as reported by Lasiuk and Fergusson (2005), that “each successive research project should be guided by the previous research study. The purpose of this systematic and ongoing investigation is the cumulative production of new knowledge in an important area of ​​nursing. By reviewing all available research, Beck was able to gain a comprehensive understanding of the maternal blues from the information she gathered. Beck then formulated a mother's attempt to cope with postpartum depression and identified four stages: the first stage, the encounter with terror, the second stage, dying of self. Third step...... middle of paper ......luwer/Lippincott Williams & Wilkins.Merriam Webster (2014). Hypothesis - Definition and more from the free Merriam-Webster Dictionary. Retrieved April 11, 2014 from http://www.merriam-webster.com/dictionary/assumptionNola Pender - Theoretical Foundations of Nursing. (2011). Retrieved April 11, 2014 from http://nursingtheories.weebly.com/nola-pender.htmlNursing Theories (2012). Health promotion model. Retrieved April 11, 2014 from http://nursingplanet.com/health_promotion_model.htmlPender, NJ (nd). Information and research for nurses around the world. Retrieved April 11, 2014 from http://deepblue.lib.umich.edu/bitstream/handle/2027.42/85352/Health_Promotion_Model-Frequent_Questions.pdf?sequence=1University of Michigan (nd). CHCR: People: Nola J. Pender, PhD, RN, FAAN. Retrieved April 11, 2014 from http://chcr.umich.edu/person.php?id=456