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when I hit 'update' on my phone app to get the next batch of cards to learn (eg. I have 10 cards unlearned left on the device out of a set total of 20), how do the new ones get selected? I do know all about the program looking into bookmarked word lists and taking out some of there + getting old ones in for re-learning (ones their sleeping time has run up), my question lies in their ratio: do the old ones get re-vived first before any new ones come in? if yes, then in theory if I were to learn, say 10 words, every day, after the first sleeping interval is over, after a while it would get slower and slower that new ones keep coming in because the old ones waking up having priority.

I am not sure if this question is understandable. If not, tell me and I'll try again :)
This question has been viewed 28 times.

There are some differences depending on the device you are using:

If you are using the new iPhone or iPad applications you will notice that we did get rid of the "Minimum number of active cards" feature as the phone includes the possibility to add additional cards locally to specific lists (based on 2 different criteria) . In that case the bookmarking of lists does not make any sense, and the "Update Cards" function will then only add the cards which did wake up.

For Android users they can still use the "Minimum number of Active cards" functionality. In those cases the priority of adding cards is first to wake up sleeping cards, and if necessary to fill up with new cards (selected form the Bookmarked lists). We are working on an Update for Android which then will have the same functions as the current iPhone iPad applications.

In relation of the quantity of cards, and the ratio between new/old waked up cards:
You are right that assuming that the number of new cards per time period remains constant then at some point there may be several times more "old" cards to review than new cards (Actually that ratio will depend strongly on how your setting regarding sleeping time and the number of sleeps for completing to learn a card are).

The concept of spaced repetition hopefully will lead to situations where you still remember the old cards and then you can pass them very fast while you can concentrate on the new ones (or some aspects of the older ones which you do not remember). In case you know an aspect well remember to use the button for "Know very well" on the website, or press long time on the green tick mark so that that mode will not be repeated again for that learning cycle).
Answered 144 months ago by klaus