'Part time workers in many types of employment are always at a disadvantage. I don't get to read 80% of my emails, do 80% of my admin tasks, fill out 80% of a form or go to 80% of meetings. This leaves me with proportionately less time than a full timer to do the supposedly core part of my job.'
I think this sums up the problem with part time working in some jobs. The whole point is that you can't get by on doing 80% of the job. As a general rule, the higher status the job, the less likely it is that you can carve the job up neatly into proportions. If you are doing a checkout shift at tesco, yes - it doesn't matter who is sitting behind the till, or whether it's the same person there at 3 pm as it was at 9 am. But when you are dealing with people, or managing people, or involved in big decisions, then it all becomes more problematic. Fact.
As a teacher, I think part time work is possible, but it depends on certain conditions- eg: job sharing if it's basically a full time job, with the proviso that both job sharers do liaison, planning etc in their own time so that the school isn't financially disadvantaged. As a parent, I would not be happy to be told at a parents evening that my child's teacher wasn't available because it's their 'time off'. I really wouldn't. parents' evenings are outside the normal working day for all teachers. I know some people are saying that two refreshed, energetic teachers are better than one tired worn out one - and I agree with that, but that's not really an issue about part timers per se. Many full time teachers are full of energy and do a great job.And equally, someone could be part time and not that great - it's about the quality of the person. I still think that if part time working is seen to throw up all sorts of obstacles, the consequence will be that part time jobs will become more rare, because employers don't want the disadvantages (quite understandably) and people will end up shooting themselves in the foot.
At the end of the day, as a Deputy Head, if I have two candidates in front of me, Mrs A who wants to work full time, and will commit to all the extras which it entails, including evenings, and Mrs B, who wants to work 3 days, which will entail the school finding someone else to work the remaining two days, and then dealing with all the hassle of Mrs B saying she won't do parents evenings on her days 'off'... what would you expect me to do? All things being equal, if they are both going to do the job well, but Mrs A will do it without the hassle, then I know who I'm going to go for. And I say that as a mother too.