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Hand Warmer Challenge Design Worksheet
Identify and Define
The Challenge: Design and develop a prototype of an effective, safe, environmentally
benign, and inexpensive hand warmer to be used at the High School.
The Constraints: The ideal hand warmer will
 increase in temperature by 20°C (but no more) as quickly as possible
 fit in the average person’s hand
 cost as little as possible to make
 use chemicals that are as safe and environmentally friendly as possible.
Gather Information
 Chemistry:
o Complete laboratory investigation and complete the following table:
Substance
Temperature
Change
Cost
Safety
Considerations
 Packaging: How are hand warmers that are on the market today designed?
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Identify Alternatives and Choose the Best Solution
During this phase, show analysis of the chemical reactions and the packaging with
considerations of the constraints (i.e. cost analysis).
Alternative #1
Chemicals:
Packaging:
Alternative #2
Chemicals:
Packaging:
Alternative #3
Chemicals:
Packaging:
Best Solution
Which alternative are you choosing to build and why?
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Implement Solution
Include a detailed scale drawing of your plans and a complete description of how the
hand warmer works.
Test and Redesign
Include a photograph of your prototype and a reflection of how your prototype can be
improved. Use the following acceptance test criteria to determine if the prototype will be
accepted or needs redesign.
Is the prototype:
 effective at increasing in temperature by 20°C (but no more) as quickly as
possible
 safe for humans to use
 environmentally benign
 inexpensive
 designed with the staff and students of the High School in mind
 fit in the average person’s hand
Build Final Prototype for Presentation
Be sure to include Product Label with the following:
 Product name
 Instructions for use
 Contents
Prepare a Team Presentation
The presentation should include each part of the engineering design process.
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CATEGORY
4
3
2
1
Criteria and Goals
All physical
criteria are met
by the product
and the product
easily meets the
functional goals
set forth in the
description.
All physical
criteria are met
by the product
and the product
almost meets the
functional goals
set forth in the
description.
Most physical
criteria are met
by the product
but the product
does not meet
the functional
goals set forth in
the description.
Engineering
Design Process
Student work
shows evidence
of ALL steps of
the EDP.
Student work
shows evidence
of the EDP with 12 missing steps.
Student work
shows evidence
of the EDP with
3 missing steps.
Product shows a
connection to the
research with
evidence of
accurate scientific
data.
Product shows a
weak connection
to the research
with evidence of
some scientific
data.
Product shows a
very weak or no
connection to the
research with
little evidence of
scientific data.
Hand warmer
shows some
originality and
inventiveness.
The hand warmer
can be used
easily.
Hand warmer
shows an attempt
at originality and
inventiveness.
The hand warmer
is a bit difficult to
use.
Hand warmer
shows very little
attempt at
original thought.
The hand warmer
is very difficult to
use.
Hand warmer
looks great and
decorated for the
audience.
Hand warmer
looks satisfactory
and decorated for
the audience.
Hand warmer
looks sloppy and
not decorated for
the audience.
PowerPoint
includes seven or
more required
components with
good detail and
evidence of
research.
Well organized,
interesting,
confident
presentation;
scientific content
communicated to
peer group.
PowerPoint
includes six or
more required
components with
limited detail and
evidence of
research.
Presentation lacks
clarity and
organization;
modestly
communicates
scientific content
to peer group.
PowerPoint
includes five or
more required
components with
little detail and
evidence of
research.
Product (x3)
Packaging
Mechanics
Packaging
Aesthetics
PowerPoint
presentation (x3)
Presentation
skills
Product shows a
strong connection
to the research
with evidence of
additional and
accurate scientific
data.
Hand warmer
shows
considerable
originality and
inventiveness.
The hand warmer
can be used
easily.
Hand warmer
looks excellent
and decorated
well for the
audience.
PowerPoint
includes all
required
components with
excellent detail
and evidence of
research.
Clear, concise,
engaging
presentation;
scientific content
effectively
communicated to
peer group.
The physical
criteria are not
met and the
product does not
meet the
functional goals
set forth in the
description.
Student little
evidence of the
EDP with 4 or
more missing
steps.
Poor
presentation;
does not
communicate
scientific content
to peer group.
Total
4
Score