List three variables that could be used in creating a model that determines the best day to plant corn in a given location.

Here's the correct answer for this question:

1. Define the Problem
J. An engineer develops a short and descriptive statement that identifies what the problem is, who should address the problem, and when and how a problem should be addressed.

2. Brainstorming Solutions
D. An engineer does not allow preconceptions to limit the different ways in which a problem could be solved.

3. Research Ideas/ Explore Possibilities
H.  An engineer collects and analyzes data to determine how well his/her solution solves the problem.

4. Specify Constraints and Identify Criteria
I. An engineer will document the essential guidelines and limitations for solving a problem.

5. Consider Alternative Solutions
A.  An engineer using a decision matrix to determine which one of his/her solution ideas meets the established criteria and constraints.

6. Select an Approach
F.  An engineer creates a 3D visual representation of his/her proposed design solution.

7. Develop a Written Design Proposal
B.  An engineer creates a mind-map of potential solution ideas regardless of feasibility.

8. Make a Model/ Prototype
L. An engineer works to determine what mathematical and scientific knowledge is essential for creating a soltuion to a problem.

9. Test and Evaluate
C.  An engineer uses data to make decisions about design alterations.

10. Refine/ Improve
E.  An engineer develops a plan of action to produce a solution to a problem.

11. Create/ Make Product
K.  An engineer sends his/her design to a maunfacturer for production.

12. Communicate Results
G. An engineer creates a formal presentation that summarizes his/her process for developing a solution to a problem.