Lesson 12: Exploring Problem Solving  Animals Theme (Alternate Lesson 3)
Overview
Question of the Day: How can we apply the problem solving process to many different kinds of problems?
In this lesson students apply the problem solving process to three different problems in order to better understand the value of each step. They will solve tangrams, choose a pet for several people, and plan a pet adoption event. The problems grow increasingly complex and poorly defined to highlight how the problem solving process is particularly helpful when tackling these types of problems. The lesson concludes with students reflecting on their experience with the problem solving process. They will justify the inclusion of each step and will brainstorm questions or strategies that can help them better define openended problems, as this is often the most critical step.
This lesson will likely take two class periods or more to complete. The first two problems may fit into a single class period but the third will need to be moved to a second day.
Purpose
This lesson provides students with more practice with the problem solving process in a variety of contexts. It highlights the fact that the problem solving process is particularly helpful when approaching poorly defined problems. The final brainstorm of the lesson provides students with some strategies and questions they can ask to better define problems for themselves, since this is often the most critical step. The problems seen in this lesson also help to drive a discussion in the following lesson about the types of problems that computers are wellsuited to solve.
Assessment Opportunities

Apply the problem solving process to approach a variety of problems
On page 5 of the Activity Guide, check the chart to make sure that students are putting in reasonable steps for each of the problems.

Assess how welldefined a problem is and use strategies to define the problem more precisely
For the last question on page 5 of the Activity Guide, make sure that students have at least one question or strategy that would be an effective way to better define a problem.
Agenda
Lesson Modifications
Warm Up (5 min)
Activity (75 min)
Wrap Up
View on Code Studio
Objectives
Students will be able to:
 Apply the problem solving process to approach a variety of problems
 Assess how welldefined a problem is and use strategies to define the problem more precisely
Preparation
 Print the activity guide for each student
 Prepare tangrams for students, or print out one tangram sheet and get scissors for each group.
 Poster to record strategies for defining problems in wrap up discussion
Links
Heads Up! Please make a copy of any documents you plan to share with students.
For the Teachers
 Exploring Problem Solving  Animals Theme  Slides
 Exploring Problem Solving  Animal Theme  Exemplar
For the Students
 Solving Problems  Activity Guide
 Solving Problems  Tangrams
Teaching Guide
Lesson Modifications
Attention, teachers! If you are teaching virtually or in a sociallydistanced classroom, please read the full lesson plan below, then click here to access the modifications.
Warm Up (5 min)
Journal Prompt: Think of the silliest problem the problem solving process could help with. Be prepared to say how each step of the process could apply.
Discussion Goal
This discussion serves as a review of the problem solving process and highlights how many different types of problems there could be. Encourage students to be creative and have some fun with the different "problems" they might solve.
Allow students to share out individually.
Remarks
With such a wide variety of problems and strategies, it's important to be able to think about how best to use the problem solving process. Today we're going to look at some different types of problems, talk about what makes them different, and reflect on how the problem solving process helped us solve them.
Question of the Day: How can we apply the problem solving process to many different kinds of problems?
Activity (75 min)
Group: For all three activities students should be working together in groups, even if they record their results individually. Groups of 24 will likely work best.
Distribute: Hand out the activity guide, one copy for each student. For now they can be face down so that the tangrams aren't visible.
Solving Problems
Teaching Tip
Integrating the Problem Solving Process: The tangrams can actually take several minutes, especially if students are approaching without some kind of strategy. Remind them that one step is to Prepare before they just jump in and start hunting.
Make It a Race: Making this problem a race is a good way to drive motivation and also ensure that groups don't share the solutions once they've found them.
Key: A key showing possible solutions can be found online following the link provided above.
Tangrams
Once students are in groups, hand them the sheets with the tan pieces. ask them to flip over their activity guides and begin the first challenge. They'll be creating the images using their tan pieces that they can cut out.
Circulate: Walk around the room observing how students are addressing the problem. Make sure that groups are not sharing answers. Encourage them to think about how making a plan might help them address this task.
Once all groups have finished, bring the class back together. Have students flip to the last page of the activity guide where there is a table to record their experiences with the problem. They will record what parts of solving this problem fall within each step of the problem solving process.
Discuss: Briefly discuss with students what parts of the activity they felt fell into each step of the problem solving process. Some possible points to make after students share are below.
 Define: This problem was already very well defined. Not all problems will be, though.
 Prepare: Developing a plan with a team (such as divvying up the images or just working together on each image) makes this problem much easier to solve than randomly placing pieces places.
 Try: Patience and persistence is important to see your plan through
 Reflect: If your early plans are not working you can regroup and choose a new plan
Teaching Tip
Integrating the Problem Solving Process: This problem is particularly challenging if you don't define the problem well. If you take it at face value, your job is to randomly guess and check where to place individual puts until you find a solution. It is much easier if you first list the possible pets for each person, then choose pets for the most selective people first.
This isn't the only approach to the problem, and you shouldn't rush to introduce it as such. Rather, encourage students to discuss with one another what they know needs to be true at the end and whether different approaches might help.
Extending the Problem: If one group finishes far before others you could give them a blank sheet of paper and ask them to solve the problem again but with a new condition of your choosing (e.g. pick one person in their solution and ask whether they can solve the problem with an added requirement.)
Choose a Pet
Move the class on to the choose a pet problem. Groups may still work together on their solutions but shouldn't share with other groups.
Circulate: As before, circulate around the room noting the types of strategies that groups are using. Remind them to use the steps of the problem solving process to help them if they're getting stuck.
Once groups have finished solving the problem ask them to move to the last page of the activity guide to record how they used the problem solving process to solve this problem.
Discuss: Briefly discuss with students what parts of the activity they felt fell into each step of the problem solving process. Some possible points to make after students share are below.
 Define: The problem seems to be a problem of choosing a pet for each person according to requirements. If you first break that problem down into choosing a pet from a list of possible pets, it is much easier.
 Prepare: Ask students to share what types of strategies they considered before just starting to assign people to seats.
 Try: As before, patience and persistence is important to see your plan through
 Reflect: If early strategies are not working groups may have regrouped and tried a more structured approach
Teaching Tip
Integrating the Problem Solving Process: This problem is intentionally very openended and in fact has students develop the criteria they'll use to measure success. This problem does the best job of highlighting all 4 steps of the process and walks students more intentionally through the Define, Prepare, Try, and Reflect stages.
Give Resource Ideas: Students may just brainstorm ideas by themselves, but also let them know about other resources such as search engines and image searchers to help give them inspiration if they are stuck. Let them look at other event pages and flyers online for help.
When to Stop: This problem could easily take a 50 minute class period. Let students know ahead of time that there are time limits on what they're doing and encourage them to think how they would improve their plan using the problem solving process if they had more time to iterate.
Plan a Pet Adoption Event
Move the class on to the Plan a Pet Adoption Event problem. Each member of the group will individually be developing a plan for a layout that follows criteria they'll develop as a team. Give students time to choose the goals they'll use to plan their plan. For example there may be certain things they'd like to move, places people will have to go, people they want to help them, etc.
Circulate: Once groups have goals, they will move through the activity by developing a plan to create the adoption event. Give them a time limit on this part of this process, e.g. 15 minutes, to make sure they focus on the key elements on their plan rather than perfecting it. They should record key information about their plan in their activity guides.
Bring groups back together and have them share their initial plans. On the activity guides they can record the feedback their classmates give them on their plans.
Once groups have discussed what they like or don't like about their classmates' proposed plans, they can reexamine them and make improvements. Are there other things they'd like to do? Do they have new goals? Give them several minutes to make improvements to their plans before deciding on a final version.
Bring the class back together and have them record the different steps of the problem solving process that they used in their activity guides.
Discuss: Briefly discuss with students what parts of the activity they felt fell into each step of the problem solving process. Some possible points to make after students share are below.
 Define: This problem was not welldefined. They needed to decide for themselves what a "good" adoption event looked like, and this definition could have even shifted throughout the process.
 Prepare: Narrowing down a list of possible layouts is helpful. You may also choose to make the point that this entire activity is an example of preparation. Some layouts just don't make sense or others work better, so you need to do the kind of planning they're doing here.
 Try: As before, patience and persistence is important to see your plan through
 Reflect: In this problem reflection came primarily through feedback from peers. Some layouts might not end up seeming as practical to other group members. Some are fun but require too much moving or too many new things. Feedback is an important part of the reflect step, especially in group work.
Discussion Goal
Goal: Students have practiced using the problem solving process on a number of different problems. Help them synthesize the notes they have been keeping to better understand the role of each step and the value of the problem solving process in general. A sample set of conclusions is below but you should allow students to share your own insights before offering your own.
Define: without defining a problem you might solve the wrong problem, not know where to start, or not know when you're finished
Prepare: Even welldefined problems usually have many possible approaches. Make each try more likely to succeed by first examining your options and anticipating challenges
Try: Without trying you'll never get anywhere. It's important to be persistent and patient so long as your plan still may work
Reflect: You'll likely not solve the problem the first time or there will be a better way to solve it. Learn from your past attempts and get ready to start the process again.
The Problem Solving Process: While you may notice you're using it even for small and trivial problems, this process is incredibly useful for large, complex, poorlydefined, or openended problems. It helps you make progress when the way forward may not always be clear.
Understanding the Problem Solving Process
Prompt: You just solved a number of very different problems. With your table groups, review the notes you took on each of the problems. Be ready to report out on the following questions
 For each step in the problem solving process, what is its purpose? Why is it included?
 Are there any kinds of problems that the problem solving process is particularly helpful at solving?
Discuss: After tables have discussed their responses for several minutes invite the whole class to share their rationale for including each step in the process. Once each step has been discussed, move on to the second question. This question may have many responses and you should allow students to share their thoughts and experiences. If it doesn't arise naturally as you leave the conversation offer some or all of the ideas mentioned in the discussion goals.
Wrap Up
Question of the Day: How can we apply the problem solving process to many different kinds of problems?
Discussion Goal
There are many different strategies to help define problems, including the questions on the previous lesson's activity guide. Some potentially useful questions include:
 Who in particular the problem affects. What specifically do they need? In what kind of situations?
 Why does the problem exist? (And why does that problem exist?) Keep asking to get to the heart of the problem.
 How could I be able to tell the problem had been solved? What could I observe or measure?
Journal Prompt: The problem solving process is particularly helpful when we encounter poorlydefined problems. We saw today that without a welldefined problem the rest of the problem solving process is difficult to follow. What are some questions or strategies we can use to help us better understand and define problems before we try to solve them?
Discuss: Have groups share quickly before taking suggestions from the class as a whole.
Remarks
Excellent work everyone. We now understand a great deal about the problem solving process. This is going to be an incredibly useful tool that we'll use repeatedly throughout the year as we dig deeper into understanding the world of computer science.
 Lesson Overview
 Teacher Overview
 Student Overview
Solving Problems KEY  Activity Guide (PDF  DOCX)
Standards Alignment
View full course alignment
CSTA K12 Computer Science Standards (2017)
AP  Algorithms & Programming
 1BAP08  Compare and refine multiple algorithms for the same task and determine which is the most appropriate.
 1BAP11  Decompose (break down) problems into smaller, manageable subproblems to facilitate the program development process.
 1BAP16  Take on varying roles, with teacher guidance, when collaborating with peers during the design, implementation and review stages of program development.