2. For the present system, define its super-systems and sub-systems
Note that subsystems are potentially all the systems adjacent to your system that can play a role in its evolution. In the case of the watering can: the water, the user (man), the soil, the plants are potentially interactors that could have an influence (implied: if they evolve in turn) on the evolution of the watering can.
In some cases, the number of sub-systems can be considerable. In such cases, it is advisable to limit their number so that the study does not become time-consuming and obscure the essentials. If you have already carried out a study according to the law of completeness, the four parts (motor, transmission, work and control) will be a good starting point, reduced to four subsystem components.
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For the present system, define its super-systems and sub-systems
Identify the right time step to make the same observations as in step 2, but X months/years in the past
Bibliography
G. Altshuller, Creativity as an Exact Science: The theory of the solution of inventive problems , Gordon and Breach Science Publishers, 1984
D. Choulier, TRIZ: a state of mind , TRIZ France, 2000
D. Cavallucci, Contribution à la conception de nouveaux systèmes mécaniques par intégration méthodologique , Louis Pasteur, 1999
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