Previous studies have small samples with small or no control groups. ALSPAC's vast data will allow for a larger sample of women who have experienced prolonged infertility. The data also provides for control groups. Due to the large numbers of variables present in the data, it will be possible to screen out for a variety of variables that might skew the data. For example, age of mother, ethnicity, socioeconomic status, and other variables. To date I have not found other studies that use the length of time of being infertile as a variable. Using the ALSPAC data, this will be possible. Instead of focusing on the type of technology used to become pregnant, I will focus on how the length of time trying to conceive influences subsequent parenting.