Purpose: The purpose of this paper is to operationalise and apply a three-level analysis of double stimulation in a Change Laboratory with teachers. Design/methodology/approach: Within qualitative inquiry, this Change Laboratory intervention was conducted as case study, by way of an intensive analysis of an individual unit. The macro-level deals with the societal problem and the collective solution found to tackle it. An intermediate level looks at the Change Laboratory as a methodology able to boost expansive learning through chains of first and second stimuli. The micro-level analyses the participants' interactions during the sessions and traces the terms connected to the first and second stimulus. Findings: This analysis suggests that the conflicts of motives experienced by the participants at the micro level refer to the aggravated contradiction identified at the macro level. Conflicts of motives seem to be superior in number during the first block of sessions, when the first stimuli are analysed. The micro analysis indicates the 6th session as the turning point of the intervention, when the participants take the auxiliary stimulus and turn it into and effective and meaningful sign. The intermediate level helps to trace the third transition from the formation of the second stimulus to its implementation, reflection upon and further development and generalisation. Originality/value: Vygotsky's method of double stimulation is crucial to develop one's agency and to explain how individuals deliberately influence events. Yet the literature is fragmented and made of brief accounts, and this paper for the first time inspects double stimulation on different levels within a Change Laboratory intervention with teachers.