When faced with a determined physical behaviour, and before being able to establish the causes of such behaviour, scientists usually have some prior hypotheses which will guide them during the research process.
The hypothesis is a preliminary answer, which is considered possible, to a problem which arises when trying to explain a phenomenon and which must be verified by experimentation.
Without a prior hypothesis you cannot have a work plan.

The visual in context

Except where otherwise noted, this work is licensed under a Creative Common License