PairDraw

Industrial Logic

Simulations & Games

Extreme Programming Simulations

PairDraw

Japanese

Solo Drawing

Pair Drawing

Pair programming is a practice used in eXtreme Programming in which two programmers work together at one computer. PairDraw is a simulation of pair programming, designed to give programmers and managers (and whoever else is curious) a feel for what pair programming is like, before they actually try it.

We use PairDraw in The eXtreme Programming Workshop and you can use it to help introduce pair programming to people in your organization.

Getting Started

It's easy to conduct this simulation. Someone must play the role of facilitator (preferrably someone who has pair programming experience). Schedule 20-30 minutes with a group of participants and make sure you have an even number of participants for pairing. Professional simulation designers suggest spending one-third of your time doing a simulation and two-thirds debriefing it.

You will need a ream of blank white paper and one color magic marker for every participant. It is best to use a good selection of colored markers, so each participant can have a unique color. Before beginning, let each participant choose a magic marker and give each participant 2 pieces of blank white paper.

The Simulation

Now, tell the participants they have 2 minutes to draw two faces: 1 face on one white sheet and another face on another white sheet. Everyone will draw these faces by themselves using their magic marker.

As soon as everyone has completed this task (or when 2 minutes is up), ask everyone to form pairs. It helps if participants pair with people they aren't best friends with, but you can let participants decide with whom to pair.

Once the pairs have formed, have each pair find a comfortable place where they will be able to draw together. Each pair should have 2 different color magic markers: So if Jon and Jane pair, they can't both have blue markers. Pairs should use colors that are different in hue (not green and light green) so that it will easy to see which participant contributed what to each drawing.

Give each pair 2 sheets of blank white paper (or you can have them all work on a white board) and ask them to PairDraw a human face (one face per sheet of paper).

When every pair has completed drawing 2 human faces, the entire group can assemble for the debrief.

The Debrief

Simulation designers often say the simulation is the excuse for the debfrief. Before starting your debrief of PairDraw, have everyone place their solo drawings in front of them and their pair drawings in the center of the table. Here are some examples of solo and pair drawings made by participants in The eXtreme Programming Workshop (solo drawings on the left, pair drawings on the right):

Before you begin the debrief, it's good to have everyone see all of the faces that have been drawn. You can simply assemble them on the floor or on a table.

The facilitator now starts the debrief. Below are few ways I've learned to conduct this debrief:

One Question
The facilitator asks all participants one single question: What was that like for you? The facilitator then records what people say (usually on a white board or flip chart). This is a simple and effective way to debrief this exercise.
Many Questions
This style of debrief is more of a dialogue and is also effective. The facilitator asks lots of questions (see below) to understand how people felt about various things during the simulation. Good questions to ask include:
- How did you feel when you were drawing solo vs. drawing in a pair?
- What do you notice is the same or different about the solo and pair drawings?
- Which of the drawing are more artistic or more orginal - the solo or pair drawings?
- Did you find yourself concentrating more or less during pairing?
- Was it more fun to draw alone or in a pair?
- What did you like and what didn't you like about drawing alone or in a pair?
- What was it like not knowing what your pair would draw next?
- Did you find yourself mirroring your pair? (For example, your pair draws an ear and than you draw an ear).
- Do you think that people get better at pairing over time?
- How do you think the simulation differs from real-world pair programming?
- Who is that wierd looking guy with the horns?

After the debrief, the facilitator can invite people to take home their drawings and encourage participants to lead others through the PairDraw simulation. Ofcourse, after doing PairDraw, it is nice to try some real pair programming. For research, diagrams, experience reports, and tips and tricks about pair programming, check out some of the links on the right side of this page.

Variations

Here are a few variations of PairDraw:

XP-Style
On an eXtreme Programming project, programmers change pairs all of the time. You can simulate this in PairDraw by letting one pair draw one face, then form new pairs to draw a new face, and so on. Add initials to each drawing to keep straight on who drew what.
Houses
Instead of, or in addition to human faces, pairs can also try their hand at drawing houses.
Tell us about your variation on this simulation.

Created By...

PairDraw was created by Joshua Kerievsky after he was inspired in Alain Rostain's fantastic workshop, Improv-It: 30 Interactive Learning Activities that Unleash the Genius of Groups.

Feedback

We'd love to hear your feedback about this simulation.

Check out
PairProgramming.com

The Wiki Web has some great stuff on PairProgramming

William Wake has a
pair programming simulation

Don Wells
has an interesting
page about pairing
and Collective Code Ownership