I have limited time and space with students, so I stood in the middle of the room and asked for instructions to draw a smiley face on the board. The whole class participated and it was evident very quickly that their instructions had to be specific. For example, students needed to tell me how many steps to the board, I needed to pick up the marker AND take the cap off before I could draw a circle. I made a point of doing the opposite of what they intended unless they gave specific instructions. I made a tiny circle for the face until they specified a size, etc.We talked about the necessity of sequencing - especially with recipes.
We talked about what an algorithm is before and after the activity. They gave examples of other algorithms (recipes, origami).
When I do this again, I'll have a follow up activity where they each need to come up with 3 different algorithms at home to share with the class and I might find a creative way for them to remember the word algorithm.