Planning and carrying out investigations to answer questions or test solutions to problems in K–2 builds on prior experiences and progresses to simple investigations, based on fair tests, which provide data to support explanations or design solutions. 

• With guidance, plan and conduct an investigation in collaboration with peers (for K).  

• Plan and conduct an investigation collaboratively to produce data to serve as the basis for evidence to answer a question.  

• Evaluate different ways of observing and/or measuring a phenomenon to determine which way can answer a question.  

• Make observations (firsthand or from media) and/or measurements to collect data that can be used to make comparisons.  

• Make observations (firsthand or from media) and/or measurements of a proposed object or tool or solution to determine if it solves a problem or meets a goal.  

• Make predictions based on prior experiences. 

Planning and carrying out investigations to answer questions or test solutions to problems in 3–5 builds on K2 experiences and progresses to include investigations that control variables and provide evidence to support explanations or design solutions.  

•  Plan and conduct an investigation collaboratively to produce data to serve as the basis for evidence, using fair tests in which variables are controlled and the number of trials considered.  

• Evaluate appropriate methods and/or tools for collecting data.  

• Make observations and/or measurements to produce data to serve as the basis for evidence for an explanation of a phenomenon or test a design solution.  

• Make predictions about what would happen if a variable changes.  

• Test two different models of the same proposed object, tool, or process to determine which better meets criteria for success. 

Planning and carrying out investigations in 6-8 builds on K-5 experiences and progresses to include investigations that use multiple variables and provide evidence to support explanations or solutions. 

• Plan an investigation individually and collaboratively, and in the design: identify independent and dependent variables and controls, what tools are needed to do the gathering, how measurements will be recorded, and how many data are needed to support a claim.  

• Conduct an investigation and/or evaluate and/or revise the experimental design to produce data to serve as the basis for evidence that meet the goals of the investigation.   

• Evaluate the accuracy of various methods for collecting data.  

• Collect data to produce data to serve as the basis for evidence to answer scientific questions or test design solutions under a range of conditions.  

• Collect data about the performance of a proposed object, tool, process or system under a range of conditions.