Shirking from home
Its a good job that most companies have realised that it matters more about what you deliver, rather than where you sit and that those who really do work from anywhere deliver more over a wider time frame than the 9-5 clock watchers who just coast a desk Monday to Friday whilst shuffling papers here and there and trying to look busy when people come past.
The only real issue are the remote workers who don't actually produce any output, hence the expression shirking from home, but they are generally the ones that don't do anything in the office either, so measuring output is a consistent way of seeing who's good value in their role, irrespective of where they sit.
How you measure productivity is the big issue that nobody seems to have properly defined, is it how many documents you pump out; the quality of any documentation; customer satisfaction; how many calls people handled; the number of hours sat in meetings or the output from those meetings ?
This is because it varies person to person depending on their position and role, so like the location you work from, one size doesn't fit all. Companies who realise that flexible working is important will generally attract better people.