NOTE: Since creating this post I have launched the Slicing Pie Pie Slicer software that keeps track of all types of contributions.
There are a lot of time-tracking tools available online. Many of them will work just fine. I’ve tried a number of them and I like Harvest (GetHarvest.com) the best. It is easy to use and tracks both time and expenses. It is an invoicing program. When you generate an invoice the time log is locked which will help you avoid the mistake of double-booking time.
Most of these programs are overpriced. Harvest is $5/month/person. This can add up when you have a large team, but I spend the money because it saves a lot of time vs. Excel. It also comes with a phone app that I use regularly.
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Hours Tracking is another good option and only $1/month. http://hourstracking.com Super simple/not overly complicated, which I like.
[…] Time is extremely easy to measure and track. To mitigate the risk that the time is unproductive we use the Grunt Hourly Resource Rate (GHRR!) which provides a proxy for productivity and value creation. The best predictor of future behavior is past behavior. People with lots of experience are likely to apply that experience in the future. These people, therefore, would have a higher GHRR! than someone with less experience. […]
FYI – getharvest has free trial version and their current Nov 2015 pricing is $12/person
[…] Time is extremely easy to measure and track. To mitigate the risk that the time is unproductive we use the Grunt Hourly Resource Rate (GHRR!) which provides a proxy for productivity and value creation. The best predictor of future behavior is past behavior. People with lots of experience are likely to apply that experience in the future. These people, therefore, would have a higher GHRR! than someone with less experience. […]