Going crazy trying to keep track of what every villager is working on? In VV4 I found it helpful to dress all of the villagers in a specific "uniform" that I chose, a different uniform for each trade. All male farmers wore 1 green outfit, all female farmers wore 1 green outfit, etc. The ones I chose are shown in the attached photo. From left to right is: Farmers, Builders, Researchers, Doctors, Parenting. Those who mastered all 5 skills got to wear any outfit they wanted other than those delegated to uniforms. I found it easier this way so that all I had to do was look at the outfit to know what the villager should be doing.

I also added their "trade" as their last name so "Tonga" became "Tonga Farmer" since she was leaning farming. When I clicked on her to show her skill level, if it showed "Master Farmer" then I had her change clothes and skill preference. When she went on to learn building her name became "Tonga Builder" and I changed her uniform to the one I had selected for builders. Made good use of all the tech points since I had nothing else to spend them on.
This can be done with the VV5 skills as well.
