Electronic spreadsheets and online weather databases are excellent tools for making real-world comparisons of local, national, and global climate trends. The activities described in this article incorporate these tools to help familiarize students with electronic spreadsheets and how to use authentic data sets available from the internet to answer…

Reports research concerning the definition of variables by pupils ages 12 to 14 during investigative work. Findings suggest that an increase in the complexity of an investigation lowers the ability to identify relevant variables and substantive concepts intrude on the ability to define the appropriate dependent variable and to control variables.…