The 144 worksheets contained in these two packages (one package for each of the first two years of a Scottish science course based on the syllabus developed by the Working Party on Secondary School Science and described in SE 015 432) have been designed to suit a broad ability range of students between the ages of about 11 and 14. The sheets contain guidance for investigations for each of the 15 units, but are not intended to be the only resources used in teaching courses based on the syllabus outlined by the working party. They are compatible with the textbooks described in SE 015 431, but are not dependent upon them. See also SE 015 433 and SE 015 435. (AL)