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RHY.2:3 - Forces
| Force | Practical tension |
|---|
| Selection makes analysis usable | Too much detail hides the question; too little erases a consequential relation. |
| Events can be convenient units | Smooth changes may have no unique start or stop to segment. |
| Several grains can matter | Local articulation may depend on a phrase, a continuous carrier or another participant’s activity. |
| A recording supports limited claims | Visible, audible, felt and measured changes can require different observations. |