Create teams of four participants, explain the task below and run the challenge.

The task is simple: in eighteen minutes, teams must build the tallest free-standing structure out of 20 sticks of spaghetti, one yard of tape, one yard of string, and one marshmallow. The marshmallow needs to be on top.

Emphasise the following details of the instructions:

Build the Tallest Freestanding Structure: The winning team is the one that has the tallest structure measured from the table top surface to the top of the marshmallow. That means the structure cannot be suspended from a higher structure, like a chair, ceiling or chandelier.
The Entire Marshmallow Must be on Top: The entire marshmallow needs to be on the top of the structure. Cutting or eating part of the marshmallow disqualifies the team.
Use as Much or as Little of the Kit: The team can use as many or as few of the 20 spaghetti sticks, as much or as little of the string or tape. The team cannot use the paper bag as part of their structure.
Break up the Spaghetti, String or Tape: Teams are free to break the spaghetti, cut up the tape and string to create new structures.
The Challenge Lasts 18 minutes: Teams cannot hold on to the structure when the time runs out. Those touching or supporting the structure at the end of the exercise will be disqualified.
Ensure Everyone Understands the Rules: Don’t worry about repeating the rules too many times. Repeat them at least three times. Ask if anyone has any questions before starting.

After the clock runs out, ask everyone in the room to sit down so everyone can see the structures. Measure the structures and announce the winning team.

After the challenge is finished, move on with the debriefing (using the attached ppt for the next block)

Source: Tom Wujec - Marshmallow challenge

Workshop planning made simple and fun!

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