what does STEM stand for exactly?

what is the age of the students to be tested?

domain free questions would imply you are purely testing creative problem solving skills (at a very aggregate level)

To measure creativity is a challenging task. To give students a problem-solving task, it is important to keep in mind that prior knowledge, the context of the problem, and the maturity of the skills for the given task play a pivotal role. To give students a 30-minute test measuring "creativity" may provide insights on the students' thought process at that particular time. It may be necessary to give the 30-minute test multiple times in different STEM contexts/settings over a period of time to have a better representation of the students' creativity in STEM.

Thank you for your answers. STEM stands for Science, Technology, Engineering and Mathematics. The age of the students is 20-30 y.o. The test should be reliable and well-established. It should measure the creative problem solving aspect of creativity. It will be administered in the beginning and the end of a 3-month period. The intention is to check whether the regular use of non-routine questions (e.g. puzzles, paradoxes) over that period increases students' creativity.

i am sure you know all this, but you can use a control group - students who did not receive the training. you can test their creativity/ development pre and post the training.

generally there are 2 methods to test creativity. applying a creativeness test, etc, or evaluating their creative output, normally involving experts as judges.

i wonder whether there is a problem solving test. in terms of problem solving output, talk aloud is also a method commonly used. from this you would be able to pick up whether there is change in language and thus change in thinking.

you would have to carefully select the problems you present to them for solving

Many thanks Brian.