@michael - All households are subject to the UHC mode. The UHC mode ensures that all households are visited and given the same treatment regardless of their location. It is on this basis, UHC mode, that tasks are generated and that all households in a single VHT’s catchment are visited.
Tasks are generated from routine visits as a factor of UHC mode, and these are created indiscriminately. Thereafter, VHTs would complete tasks based on their due dates. Proximity based prioritisation would simply compliment the due date by identifying those tasks closest to a VHT at any given time as long as they are due.
Scenario - If a VHT has 6 tasks due today, he would complete them as they are arranged in his tasks bar. But while these tasks are all due, geographically, there is no linear order to this list. The challenge here is that the when there are multiple tasks due for the same day, the tasks list is random. As a VHT begins to complete the tasks list (among those that are due) he may move far for one task and leave behind a task that may have been situated in a household close to him before he embarked on a journey to complete a far flung task. And upon completing it, he may realise that at the time he went to complete the first task he missed an opportunity to complete a task that was close by. There’s currently no way for a VHT to know this except by his own familiarity with his clients and their names.
This is because the tasks bar is static. With a non-static tasks bar, in this scenario, the tasks would have shuffled to bring to the top of the list those tasks which were in his vicinity in that moment. Even without knowing the clients names off the top of his head, it would be clear that the tasks at the top are closest. On each task, there can be a small indication of the distance in metres from him.
In the end, if there is no task due in his immediate vicinity, the task bar would shuffle to the top, those tasks due even if geographically they are some distance away. In this way, the VHT would not go back and forth inconveniently across distances. Completing all tasks due would simply mean returning home.