For someone with ADD, it can be extremely difficult to keep track of even 3-4 relatively simple items that need completed in a day. They will get distracted by something minor, and 8 hours later have completed 20 things in a highly productive manner, but 0 of the 3-4 important items they were supposed to do (and most likely, they will have forgotten those items existed entirely). For me what works is starting each day with a list of 3 items that need done that day, and to check that list about every 30 minutes all day long.