2.2. Data collection tool Problem posing and solving tests which encompassed the sub-problems were developed. The tests were composed of items which includes symbolic or figural representations about the pattern of series and sequences. The opinions of three experts and relevant literature were used to ascertain the reliability of the tests. Prospective teachers were asked to pose three different problems which included models in each open-ended item of problem posing tests. Each one of problem posing-solving tests was composed of three items. Furthermore, each item in the problem solving test had two choices. Each item in the problem solving test included patterns in problem posing test.