This is a general template I ask students to use when writing a lab report. Sometimes I will provide the problem and/or materials. Sometimes I will provide them with everything except the hypothesis, data, and conclusions. It's very easy to adapt this to your classroom. I especially like it when students are doing inquiry labs or a lab to introduce the scientific method. During these types of labs almost every lab group is doing something different. If they all use the same template, however, it provides some consistency with the grading and students know what information to record.