# Maturity based on stability **URL:** \ **Category:** Suggestions\ **Created:** [November 8, 2024, 12:15pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718 "2024-11-08T12:15:53Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![anon12869913](https://avatars.discourse-cdn.com/v4/letter/a/43a26b/32.png) [@anon12869913](https://forums.ankiweb.net/u/anon12869913)\ **Post date:** [November 8, 2024, 12:15pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/1 "2024-11-08T12:15:53Z")
Maturity state is currently based on interval. This leads to changes in desired retention having a significant impact on maturity counts, which seems counter intuitive. My intuition of maturity is classifying cards based on how well I remember them, ie the stability of my memory of them. Does it make sense to redefine maturity to be classified based on card stability? ---
**Author:** ![Expertium](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/expertium/32/24176_2.png) [@Expertium](https://forums.ankiweb.net/u/Expertium)\ **Post date:** [November 8, 2024, 12:47pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/2 "2024-11-08T12:47:16Z")
That’s a good idea, but it would cause inconsistencies when switching from SM-2 to FSRS or vice versa ---
**Author:** ![sorata](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/sorata/32/34115_2.png) [@sorata](https://forums.ankiweb.net/u/sorata)\ **Post date:** [November 8, 2024, 1:08pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/3 "2024-11-08T13:08:13Z")
> [@anon12869913](#): > > Does it make sense to redefine maturity to be classified based on card stability? That doesn’t change the fact that mature is arbitrary category. Any ideas on that? ---
**Author:** ![anon12869913](https://avatars.discourse-cdn.com/v4/letter/a/43a26b/32.png) [@anon12869913](https://forums.ankiweb.net/u/anon12869913)\ **Post date:** [November 8, 2024, 1:34pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/4 "2024-11-08T13:34:43Z")
You could also see it as reducing inconsistency, as FSRS with non-90% target retention introduces very large inconsistencies in mature counts. ---
**Author:** ![anon12869913](https://avatars.discourse-cdn.com/v4/letter/a/43a26b/32.png) [@anon12869913](https://forums.ankiweb.net/u/anon12869913)\ **Post date:** [November 8, 2024, 1:36pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/5 "2024-11-08T13:36:18Z")
I don’t think the arbitrariness of 21 days is an issue. It’s a nice at a glance metric for how many cards I remember “well”, and how stable my level of knowledge is. I prefer it over the estimated knowledge based on retention as that doesn’t indicate how fast that estimated knowledge decays. ---
**Author:** ![Danika\_Dakika](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/danika_dakika/32/17815_2.png) [@Danika\_Dakika](https://forums.ankiweb.net/u/Danika_Dakika)\ **Post date:** [November 9, 2024, 4:44pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/6 "2024-11-09T16:44:46Z")
Stability isn’t any more “stable” than interval length though. It can change any time the memory state for a card is recalculated – which, for instance, happens every time you optimize, regardless of whether you reschedule (which might change the interval). I would think (outside of studying) Stability will change more often than interval for a typical user. > [@anon12869913](#): > > It’s a nice at a glance metric for how many cards I remember “well” I would think you would value cards varying between young and mature then. When they shift, you are getting adjusted to more accurate information. ---
**Author:** ![sorata](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/sorata/32/34115_2.png) [@sorata](https://forums.ankiweb.net/u/sorata)\ **Post date:** [November 9, 2024, 5:08pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/7 "2024-11-09T17:08:51Z")
> [@anon12869913](#): > > I prefer it over the estimated knowledge based on retention as that doesn’t indicate how fast that estimated knowledge decays. You can look at average stability. That’s least arbitrary. ---
**Author:** ![anon12869913](https://avatars.discourse-cdn.com/v4/letter/a/43a26b/32.png) [@anon12869913](https://forums.ankiweb.net/u/anon12869913)\ **Post date:** [November 9, 2024, 5:13pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/8 "2024-11-09T17:13:51Z")
I have 2 decks with different target retentions. It’s nice to be able to glance at each and see how much of each deck I remember well in a way which is consistent between the two decks (which I’m defining as approximately what percentage I won’t have forgotten if I don’t study for a while). With the different target retentions the current interval based mature count becomes not useful for this. A stability based mature count would give a reasonable estimate at the number I care about. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex002/uploads/anki2/original/1X/8f1279ababc5879d54e4838989f606cfe55af8c7.jpeg) [@system](https://forums.ankiweb.net/u/system)\ **Post date:** [December 9, 2024, 5:14pm UTC](https://forums.ankiweb.net/t/maturity-based-on-stability/51718/9 "2024-12-09T17:14:10Z")
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