The third stage, explanation, allows the teacher to divulge important information to the student. It is in this stage that the teacher should impart specific correct information about the exploration stage. The fourth stage, elaboration, is where the student builds on what has been learned in the first two stages. It may involve the student conducting a laboratory activity on their own or a variation of the previous lab in the explanation stage. The last stage, evaluation, does not necessarily mean test in the traditional sense.
Evaluation can be a formal lab report, and oral presentation to the class, or a portfolio.
Graphing software is an excellent analysis tool. The Internet is a wonderful data collection and or exploration tool. Try your ideas out. Once you have your students interested, decide how to explain the situation with which you have presented to them. Above all, remember it does not have to be in the form of a lecture.