The OASIS project aims at optimizing the science production of the Advanced GAmma-ray Tracking Array (AGATA) gamma-ray spectrometer. Presently installed at the Grand Accélérateur National d'Ions Lourds (GANIL) at Caen, France, AGATA has passed the demonstrator phase of its early implementation (15 high-purity germanium detectors) and now contains 32 such detectors with infrastructure to accommodate 45 detectors covering 1pi of solid angle. AGATA is a new generation gamma-ray spectrometer designed to overcome the inherent limitation of the previous generation of Compton suppressed HPGe detector arrays. By replacing the Anti-Compton shields, which occupy a significant amount of solid angle, with HPGe detectors solid angle converage, and hence efficiency, can be increased. However, for this approach to produce high quality gamma-ray spectra an alternative Compton suppression technique has to be developed. This is gamma-ray tracking: The energy and position of individual gamma-ray interaction points inside the HPGe is determined using highly segmented detectors combined with digital electronics and pulse-shape analysis. These interaction points are then tested for the hypotheses that they belong to a fully absorbed gamma ray. For the gamma-ray tracking to work the gamma-ray interaction points have to be located to within 5 mm inside the detectors. A very important additional increase in performance comes from the very high effective angular granulation of AGATA given by knowing the interaction positions giving very good Doppler Correction capabilities, something very important in modern experimental nuclear structure research. Because of the high performance of AGATA it is considered a very important detector for the future and present nuclear structure research facilities in Europe, such as FAIR, HIE-ISOLDE, SPES, and SPIRAL2. Since the first physics campaign with AGATA started has showed its high performance in experimental situation where the sensitivity is dominated by the Doppler broadening of the gamma-ray peaks, for high-count rate situations, and when it is beneficial to have a very compact gamma-ray spectrometer - AGATA has proven the be a technical success in many ways. During the work analyzing experimental data the AGATA collaboration, and the gamma-ray tracking community, has however seen that the performance of AGATA in terms of Compton suppression from the gamma-ray tracking is not what simulations suggests it should be. It is believed in the gamma-ray tracking community that cause for this is related to problems with the pulse-shape analysis. Although the nominal position resolution from the pulse-shape analysis is within the required limits several indications points to that the pulse-shape analysis does not perform as good as is needed. The OASIS project aims at carefully investigating the reasons for this using computer simulations to try to reproduce and understand the deficiencies seen in experimental data. One particular problem that will be addressed within the OASIS project is that of correctly determining the number of actual interaction that a gamma-ray has had with the AGATA.Several novel ideas are to be investigated. Finally, many aspects of analyzing -ray spectroscopy data have to be reviewed when using AGATA. This mainly comes from the fact that there is more detailed information to look at offering new possibilities. What was previously simple calibration procedures using source data, such as efficiency calibrations, now has complex dependencies on the experimental situation and choices made for the gamma-ray tracking algorithms. Other methods, e.g. to determine angular correlations and distributions, also need to be developed specifically for gamma-ray tracking. A part of OASIS is dedicated to this work, making sure that the gamma-ray tracking community will have thoroughly tested and quantified procedures.