A robot demonstration can look consistent while small details keep changing. The position of a block, the arrangement of the workspace and the sequence of commands all influence what an observer sees. A short experiment log helps turn a memorable afternoon into something that can be revisited.
Give each trial a simple identifier and describe the setup before writing the result. Record the intended action, the initial arrangement and the single change you are testing. A photograph from the same viewpoint can provide context without replacing a written description.
Separate observation from explanation. “The block stopped before the marked area” is an observation. “The movement command was too short” is a possible explanation that still needs checking. Keeping those sentences apart encourages useful follow-up questions.
End each entry with a next step small enough to perform on its own. Avoid rewriting the whole project after one unusual result. Over time, a modest log reveals which adjustments helped, which assumptions failed and which conditions need more careful control. That record is valuable even when the final mechanism looks very simple.
