This unit can be used to develop students’ ability to plan investigations, develop hypothesis, distinguish alternatives, searching for information, constructing models and debating with peers. It covers different types of inquiry activities, from interactive demonstration to open inquiry.  The main problem dealt with the unit is divided in sub-problems faced in the different subunits that develop by increasing student participation and independence.The unit can be implemented in different ways, and for each sub-unit emphasis can be placed on different elements of inquiry. However, in each sub-unit a progression in assigning autonomy to student is foreseen by making the suggested questions more general.  In each subunit, the teacher may start with either a series of questions or with an interactive demonstration, like in subunit 2, where the initial demonstration poses the problem to be investigated and inquiry can be developed in different steps (some of them are suggested by the activities that lead to questions for further investigations). All the activities may be guided, bounded or lead into open inquiry settings. However, the initial activities given in each sub-unit will form the background for further open inquiry activities to be performed by students.In order to focus on the different skills connected with the inquiry process, the starting point of each activity is a well defined problem whose solution requires students’ engagement, raising questions and developing hypotheses.  The teacher control of students’ activities is mainly connected with students’ expertise in autonomous work and during the succession of the proposed activities  the degree of teacher’s guidance decreases. Details about the inquiry types and E-emphasis will be supplied for each sub-unit.