Equity theory, most popularly known as equity theory of motivation, was first developed by John Stacey Adams, a workplace and behavioral psychologist, in 1963.
On average there are about 4.3 weeks in a month. Each week is 7 days, and there are normally either 30 or 31 days in a month, so there are usually between 4.2 and 4.4 weeks per month. The exception is February because it has fewer days, so there are about 4 weeks in that month. On average there are about 4.3 weeks in a month.
Find how many weeks pregnant you are on the chart below and scan back to see approximately how many months pregnant you are. (Note that you're not one month pregnant until it's been one month since your LMP.). Actually, the only month that's four weeks (or 28 days) long is February â that is, when it's not a leap year. All the others are either 30 or 31 days. So, on average a month is 30.4 days long â or 4.3 weeks. 1  Click here for a printable version of this chart showing how the weeks, months, and trimesters of pregnancy line up with each other.