Benchmark 1B
The Nature of Science: Scientific Inquiry
Grades K-2, page 10

Describing things as accurately as possible is important in science because it enables people to compare their observations with those of others.
 

NSES Content Standard A  
Science as Inquiry: Abilities necessary to do scientific inquiry 
Grades K-4, page 122 
Plan and conduct a simple investigation. In the earliest years, investigations are largely based on systematic observations. As students develop, they may design and conduct simple experiments to answer questions. The idea of a fair test is possible for many students to consider by fourth grade. 

NSES Content Standard A  
Science as Inquiry: Understanding about scientific inquiry 
Grades K-4, page 123 
Scientists make the results of their investigations public; they describe the investigations in ways that enable others to repeat the investigations.