What Is a Sequence?

A sequence is a set of instructions that run one after another, in order, from top to bottom.

Order Matters!

Consider these two stacks — they do very different things:

• Stack A: say “Ready!” → move 100 steps → say “Done!”
• Stack B: move 100 steps → say “Ready!” → say “Done!”

In Stack A the cat speaks before moving. In Stack B it moves first — a different result from the same three blocks just rearranged.

Key Point

Scratch runs your blocks from the top block downward, one at a time, finishing each before starting the next.