Difference between the static group comparison design and the posttest-only control group

What is the difference between the static group comparison design and the posttest-only control group?

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...s the control group. An intervention is administered to the experimental group and then both groups are observed and recorded. The groups must be considered as non equivalent because subjects are not randomly assigned to the groups.
A group that has experienced some treatment is compared with one that has not. Observed differences between the two groups are ...