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In fact, practical ability is the embodiment of high efficiency in the interactive process, and it is the external embodiment of the overall comprehensive behavior such as cognition, observation, planning and function. Hands-on ability usually interacts with objective entities, such as some tools. Therefore, practical ability can often be reflected in the proficiency in the use of some tools. But the skillful use of tools is only the most prominent aspect, and there are other aspects, such as the effect and efficiency of completing hands-on interaction.

In the previous discussion about subjective system, we mentioned the cross-linking characteristics of subjective system, that is, there is a hierarchical and related cross-linking transition zone between observation system, thinking system and practice system. Because of the existence of the transition zone, the observation, thinking and practice at the bottom can be realized in a very fast channel, thus achieving efficient interactive behavior. Hands-on ability comes from the bottom cross-linking system to a great extent, which makes the process of observation, thinking and practice very fast.

This also explains why many times the hands-on ability is innate. Of course, the influence of the day after tomorrow is also very great.

The basis of interaction is cognition, which also plays a great role in the process of hands-on practice. Different from other abilities, the cognition of the object in the hands-on ability does not need to be very high, and it is usually through constant attempts to achieve the goal. In the process of trying, the subject can restrain the problems caused by the one-sided cognition of the interactive object through the cognition of other related objects, so as to keep approaching the goal.