Data, data, data, I cannot make bricks without clay

It's progress report time again! How do you take data?

Sometimes it seems that there are nearly as many ways to take data as there are teachers. I have settled on a system that works for me. Each area of my classroom has data collection sheets on clipboards with my students' goals and objectives listed on them. I like to organize the goals by activity, so if a student has social/emotional goals like conflict resolution skills, data is most likely to be collected during leisure/recess time, not during daily living activities (there are always exceptions to the rule however). This system allows me to take data on any student during a particular activity.
When a student completes the task exactly as it is written in the objective, we mark it with a plus, if not then with a minus. My EAs understand that when the objective requires students to complete the task independently, it means that he or she must perform the task without any prompts (initial cues don't count as prompts). When prompts are used, we record it by writing a G for gestural prompt, V for verbal prompt, P for partial physical, and F for full physical prompt. This detailed data helps me assess student progress and adjust the program.

Some teachers create individual data sheets for each student and take data on 2-3 individual students per day. I find that my system works for me because there are less papers to keep track of and manage and none of the students get "forgotten". What works for you?