Jessi and Squeaks want a way to let their friends know when it's time to play at the Fort, so they work together and use engineering to build a prototype solution! NGSS: ETS1.A : Defining and Delimiting Engineering Problems A situation that people want to change or create can be approached as a problem to be solved through engineering. (K-2-ETS1-1) Asking questions, making observations, and gathering information are helpful in thinking about problems. (K-2-ETS1-1) Before beginning to design a solution, it is important to clearly understand the problem. (K-2-ETS1-1)