The average menstrual cycle is 28 days long. However, a normal cycle can be shorter or longer than this. It may be anywhere from 21 to 35 days long. Most periods last 3 to 5 days, but anywhere from 2 to 7 days is normal.Menstrual cycles may happen around the same date every month or they may be irregular.A menstrual period is considered late if it hasnât started 5 or more days after the day you expected it to start.A period is considered missed if you have had no menstrual flow for 6 or more weeks after the start of your last period.enstrual cycles may happen around the same date every month or they may be irregular. A menstrual period is considered late if it hasnât started 5 or more days after the day you expected it to start. A period is considered missed if you have had no menstrual flow for 6 or more weeks after the start of your last period.
Transcript of Theory of Dorothy Johnson. Theory of Dorothy Johnson. The Behavioral System Model. Johnsonâs Behavioral System Model is a model of nursing care that advocates the fostering of efficient and effective behavioral functioning in the patient to prevent illness.
In 1953, Henderson began teaching at the Yale School of Nursing and continued to teach there with emeritus status until 1996. She wrote and published numerous textbooks throughout her career, as well as The Nursing Studies Index, a 12-year project in which she covered the first 60 years of nursing research. Her nursing theory, the âHenderson Model,â is used internationally as a standard for nursing practice.