# Number of cards studied affecting card retrievability **URL:** \ **Category:** FSRS\ **Created:** [November 4, 2024, 6:29pm UTC](https://forums.ankiweb.net/t/number-of-cards-studied-affecting-card-retrievability/51550 "2024-11-04T18:29:24Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![DerIshmaelite](https://sea2.discourse-cdn.com/flex002/user_avatar/forums.ankiweb.net/derishmaelite/32/17983_2.png) [@DerIshmaelite](https://forums.ankiweb.net/u/DerIshmaelite)\ **Post date:** [November 4, 2024, 8:29pm UTC](https://forums.ankiweb.net/t/number-of-cards-studied-affecting-card-retrievability/51550/3 "2024-11-04T20:29:10Z")
You are speaking of **interference** and it is a real thing. I have had this on my mind for quite a while now. > [@Influence of Interference on Retenton](https://forums.ankiweb.net/t/influence-of-interference-on-retenton/50953): > > If the size of decks and the rate of card number growth have a major role, wouldn’t it be wise to look into how they influence retention generally question I have started a new deck because of my new semester. For the past week, I have been successful in fully clearing any reviews of that deck, and I have consistently clocked true retention rates lower than 95% (my desired retention). Since I have no backlog (which I suspected earlier to be the main reason) and this deck is in co… > [@FSRS 5: Ideas and Sims](https://forums.ankiweb.net/t/fsrs-5-ideas-and-sims/51278): > > Current FSRS Ideas and Simulations at work (list being updated…) 1-Seed Collection Testing 2-Preset Size 3-Short Term Memory Model 4-Sorting Order (PSG, PRL) 5-Improving Calculations for Retrievability and Difficulty [[Enhancement] Improving the function for calculating difficulty · Issue #352 · open-spaced-repetition/fsrs4anki](https://github.com/open-spaced-repetition/fsrs4anki/issues/352)[[Feature Request] Improve Calculation of Retreivability · Issue #703 · open-spaced-repetition/fsrs4anki](https://github.com/open-spaced-repetition/fsrs4anki/issues/703) 6-Influence of Increasing Collection Size on Retention… > [@Several FSRS-related suggestions](https://forums.ankiweb.net/t/several-fsrs-related-suggestions/44673/87): > > I want to share this: As I am learning for my state medical examination, I am trying to power through all my medical Anki cards that I have amassed over 2 years. In my medical cards collection of 67,951 cards, which have not all been made at the same time but through a continuous and painful process, 9743 cards have failed. This translates into a true retention of 85.6%. My desired retention is set at 95%. This process has taken place at an average of 3000 cards per day so I don’t know if this… > [@FSRS 5: Ideas and Sims](https://forums.ankiweb.net/t/fsrs-5-ideas-and-sims/51278/5): > > I think that the size of the collection and the rate at which it grows (number of new cards per day) influences the retention of older learned cards. New cards interfere with retention of older cards → Retroactive Inhibition [Retroactive inhibition | psychology | Britannica](https://www.britannica.com/science/retroactive-inhibition)[Learning theory - Stages, Acquisition, Retention | Britannica](https://www.britannica.com/science/learning-theory/Stages-of-learning#ref586992) This also applies in the opposite direction. Older cards interfere with learning of new cards → Anterograde Inhibition So I believe that collection … > [@Several FSRS-related suggestions](https://forums.ankiweb.net/t/several-fsrs-related-suggestions/44673/97): > > Thanks. The parameters deny my hypothesis. Seems FSRS have systematic error here in your case. I suppose it is very difficult to model. I am not sure how one could model the influence of a collection’s size AND its Rate of Growth on the Retention of learned cards (aka Interference). --- _[View the full topic](https://forums.ankiweb.net/t/number-of-cards-studied-affecting-card-retrievability/51550)._