SPIKE™ Prime Set

Keep it really safe!

Use compound conditions to reinforce the encryption pattern on a safe-deposit box.

90-120 min.
Grades 6-8

Lesson plan

1. Prepare

  • Read through the student material in the LEGO® Education SPIKE App.

Engage (5 Min.)

  • Use the ideas in the Ignite a Discussion section below to engage your students in a discussion related to this lesson.
  • Use the video to explain the lesson.

Explore (20 Min.)

  • Have your students work in pairs to build the super-safe-deposit box.
  • Ask them to play the program to see how the lock works.

Explain (5 Min.)

  • Facilitate a discussion about how and when to use "AND" and "OR" in compound conditionals

Elaborate (15 Min.)

  • Ask your students to make their super-safe-deposit boxes even more secure by adding compound conditionals to their programs.
  • Don't forget to leave some time for cleanup.

6. Evaluate

  • Give feedback on each student's performance.
  • You can use the assessment rubrics provided to simplify the process.

Ignite a Discussion

Start a discussion about iteration or fixing things by asking relevant questions, like:

  • What can happen if somebody hacks your password?
  • How can you evaluate the strength of a password?
  • What's a compound condition?

Have your students watch this video to see what they're about to do.


Building Tips

Tandem Build
Split each team's building tasks to ensure that everybody is actively involved:

  • Student A: Super-Safe box
  • Student B: Super-Safe box

Align Motors Correctly
Make sure the arm is raised when you start the program.


Manual Unlock
This model has a manual key to unlock the door if needed.


Coding Tips

Main Program

SPIKE Kickstart your business Keep-it-really-safe Step03-Program - en-au

Possible Solution

SPIKE Kickstart your business Keep-it-really-safe Teacher Solution - en-au

Other Programs

SPIKE Kickstart your business Keep-it-really-safe Teacher Other - en-au


Simplify this lesson by:

  • Programming just one compound condition

Take this lesson to the next level by:

  • Having your students add more sensors (e.g., Distance Sensor, Force Sensor) to their models to create other compound conditions
  • Having each team challenge another team to unlock their super-safe-deposit box
  • Asking your students to use the NOT function when defining their conditions

Assessment Opportunities

Teacher Observation Checklist
Create a scale that matches your needs, for example:

  1. Partially accomplished
  2. Fully accomplished
  3. Overachieved

Use the following success criteria to evaluate your students' progress:

  • Students understand what a compound condition is.
  • Students are able to use compound conditions in their program.
  • Students can discuss digital security in detail and with precision.


Have each student choose the brick that they feel best represents their performance.

  • Blue: I've used one compound condition in my program
  • Yellow: I've used two compound conditions in my program.
  • Violet: I've used more than two compound conditions to create a super safe program!

Encourage your pupils to provide feedback to one another by:

  • Having one pupil use the coloured brick scale above to score another pupil’s performance
  • Asking them to present constructive feedback to one another so that they can improve their group’s performance during the next lesson

Language Arts Extension

To incorporate language arts skills development:

  • Have your students explore the meaning of digital security terminology, like:

    ▷ Boolean
    ▷ Conditions
    ▷ Compound Conditions
    ▷ AND, OR, NOR, NOT
    ▷ Encryption
    ▷ Case sensitive

Note: This will make for a longer lesson.

Students who enjoyed this lesson might be interested in exploring these careers pathways:

  • Information Technology (Computer Programming)
  • Information Technology (IT Applications)
  • Information Technology (Oracle / Database Programming)
  • Information Technology (Web Design)

Teacher Support

Students will:

  • Explore compound conditional programming

LEGO® Education SPIKE Prime Set

Australian Curriculum: Technologies
Define and decompose real-world problems taking into account functional requirements and economic, environmental, social, technical and usability constraints
Design algorithms represented diagrammatically and in English, and trace algorithms to predict output for a given input and to identify errors
Implement and modify programs with user interfaces involving branching, iteration and functions in a general-purpose programming language
Evaluate how student solutions and existing information systems meet needs, are innovative, and take account of future risks and sustainability

Pupil Material

Student Worksheet

Download, view or share as an online HTML page or a printable PDF.