Longitudinal Design One group followed and assessed at different times as the group changes with time. EX1: This type of research looks at age-related changes as changes occur in the same individuals. EX2: Some of the negative aspects of this design: they take a lot of time, cost large amounts of money, there is a loss of participants (move, loss of interest, death.)Cross-Sectional DesignSeveral different age groups are studied at the same time. EX1: This research design is quick, relatively inexpensive, and are easier to accomplish thanlongitudinal studies. EX2: Because they compare individuals of different ages to each other, there is the possibility that different educational experiences or opportunities might affect IQ scores or cohort effects might be in play. Attachment Styles EX1: Secure- curious in new environments if the mother is able to be returned to if the childwants. EX2: Avoidant- Will explorer but not react to mothers location or introduced stranger.