versions.md

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+The way to use Autosubmit in the Earth Sciences environment is to load it as a module (module load autosubmit). This will load the **default version**, which is always the **preferred** one. For a version to become the default, it has to go through a period of several months in which the software is tested, both in the Auto-models' weekly tests and in production experiments.
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+This means that the **default** version is **proved** to be robust. However, some features and improvements are only available in development versions, that we recommend to test so they can be improved further, always under the **user's responsibility**.
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+The aim of this section is to provide useful **guidelines** about the futures that the default and development versions provide, and which are our recommendations to run experiments that still are not fully supported:
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+* **3.12.0b** - Shortly, this will be the Autosubmit default. Therefore, it is the recommended software to run any kind of experiments unless there is a necessity only covered by the development versions.
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+  *  In this version vertical and horizontal wrappers are fully supported. 
+  *  Horizontal-vertical wrappers are supported too. They were first developed in this Autosubmit version and they have been used in production together.
+  *  Due to technical limitations, we don't recommend to run experiments having many startdates/members (increased concurrency) or very large wrappers with 3.12.0b. As a rule of thumb, experiments with more than 10-20 members total or wrappers with more than 50 jobs may experience delays in the Autosubmit refresh cycle and generating the monitor views.
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+* **3.12.1b** - This has been the Autosubmit development versions for many months, so it provides a lot of improvements, specially in terms of efficiency and stability. It also brings a full refactor of the wrappers module.
+  *  Multi-threaded wrappers were first introduced in this version. 
+  *  In general, big experiments, with many startdates/members or featuring very big wrappers run much more efficiently with 3.12.1b.
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