What are four skills used by scientists?

I only know of three. Observing, measuring and comparing and contrasting.

There are many skills used in different sciences you will need to be more precise.

there are many different skills in science. (There are only nine science skills that I know:)

These are:

Observing

Identifying

Classifying

Measuring

Infering

Predicting

Analyzing

Synthesizing

Formulating