I’ve almost finished the GTD book and I am hoping to start working on implementing my system over the weekend. I am currently thinking I am going to start off with a paper-based system until I get comfortable what works best for me. In my work I have several different areas of focus which all generate lots of projects with sub projects, however one of these projects has me a little perplexed on the best way of recording it and its next actions. I work within construction where I have to bill clients for work carried out by the company. The project I've got a query on is responsive repairs, this project generates over a 1000 different jobs each month, all of which needs me to value the work done and submit and invoice. Sometimes this will generate a query from the client, which I will need to answer and then possible resubmit a revised invoice. How do I keep track of this? Do I need to log each individual job as a sub project under the main project of repairs? I’m concerned the time it will take to write all these down each day/week/month would be wasted time; however, I’m also concerned by not having a specific next action relating to each of these jobs then they will still be on my mind as I'm not capturing everything? Any advice on how to deal with something like this?