In many countries, end of year and school-leaving examinations form the major part of school science assessment , for purposes of student selection. However, continuous assessment during the year is also profitable for feedback to the teacher and for monitoring of individual progress. Formative assessment of each student's progress is not easy, however, particularly in large classes. Whilst teachers should regularly check their student assignments and written work, it is also helpful to obtain regular feedback (either formal or informal) about each student.

During STL group activities, feedback can be obtained by observing each group discussion in turn, and observing the contributions of each member of the group. When groups report back findings to the rest of the class, further notes are made about individual contributions. At the end of each project, students each write a summary of what the have done. This can be assessed, and combined with the previous assessment notes. The following patern for identifiying STL assessment procedures can be recommended: