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We present CARMA, the Cluster Ages to Reconstruct the Milky Way Assemblyproject, that aims at determining precise and accurate age measurements for theentire system of known Galactic globular clusters and at using them to tracethe most significant merger events experienced by the Milky Way. The strengthof CARMA relies on the use of homogeneous photometry, theoretical isochrones,and statistical methods, that will enable to define a systematic-freechronological scale for the complete sample of Milky Way globulars. In thispaper we describe the CARMA framework in detail, and present a firstapplication on a sample of six metal-rich globular clusters with the aim ofputting the final word on the debated origin of NGC6388 and NGC6441. Ourresults demonstrate that this pair of clusters is coeval with other foursystems having a clear in-situ origin. Moreover, their location in theage-metallicity plane matches the one occupied by in-situ field stars. Such anaccurate age comparison enabled by the CARMA methodology rules out thepossibility that NGC6388 and NGC6441 have been accreted as part of a pastmerger event.

Cluster Ages to Reconstruct the Milky Way Assembly (CARMA) I. The final word on the origin of NGC6388 and NGC6441