The processes of formation and assembly of the components of the Milky Way leave strong signatures in the chemistry of stars. It is possible to use the chemical properties of different stellar populations and combine them with other signatures to reconstruct the formation and evolution of our Galaxy. The relationship between the age and metallicity of stars is particularly powerful for this purpose. Thanks to the high-quality data provided by recent spectroscopic surveys such as GALAH, it's now possible to obtain the local age-metallicity relation with unprecedented accuracy. However, to fully understand the global picture it is necessary to link the patterns in the solar neighbourhood and on larger scales. What is the relationship between these different patterns? Can we explain them as separate evolutions or are they connected? These are just some of the open questions that the combination of APOGEE and GALAH datasets can help to answer.
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