Benchmark 3B
The Nature of Technology: Design and Systems
Grades K-2, page 49

People may not be able to actually make or do everything that they can design.
 

NSES Content Standard E 
Science and Technology: Abilities of technological design 
Grades K-4, page 137 
Propose a solution. Students should make proposals to build something or get something to work better; they should be able to describe and communicate their ideas. Students should recognize that designing a solution might have constraints, such as cost, materials, time, space, or safety. 

NSES Content Standard E 
Science and Technology: Abilities of technological design 
Grades K-4, page 137 
Implementing proposed solutions. Children should develop abilities to work individually and collaboratively and to use suitable tools, techniques, and quantitative measurements when appropriate. Students should demonstrate the ability to balance simple constraints in problem solving.