Lab-notebook entries are made collaboratively during labs, and used later to write more careful and detailed individual lab reports.
See the instructions below for important information about completing your lab-notebook entries.
Your collaborative lab-notebook entries should contain the data and notes you need in order to write your individual lab reports. The format is flexible and generally up to your discretion. Make sure you record enough so you won't have to redo any work while writing the report, but don't write so much it interferes with finishing the work itself during lab.
You don't need complete sentences in your lab notebook, and you don't need any thorough explanation of your reasoning. Stick to the facts of what you did and saw: inputs you tried, the program behavior and output you observed, the lines of code you modified. (The lab report is the place to explain in complete sentences why you did what you did, how you interpreted what you saw, and perhaps what you learned or what you would have done differently in retrospect.)
Don't wait until you've fixed a bug to start recording detail. Record what you do and observe, even when it leads to discarding hypotheses and forming new ones. When you write your lab report later, you'll be able to look at this detail and recall how you decided which hypotheses were invalidated and which were supported by the results of your experiments.