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In this paper, we use Cluster datafrom one magnetopause event on 5 July 2001 to compare predictions from variousmethods for determination of the velocity, orientation, and thickness of themagnetopause current layer. We employ established as well as newmulti-spacecraft techniques, in which time differences between the crossingsby the four spacecraft, along with the duration of each crossing, are used tocalculate magnetopause speed, normal vector, and width. The timing is based ondata from  either the Cluster Magnetic Field Experiment (FGM) or the ElectricField Experiment (EFW) instruments.The multi-spacecraft results are compared with those derived fromvarious single-spacecraft techniques, including minimum-variance analysis ofthe magnetic field and deHoffmann-Teller, as well as Minimum-Faraday-Residueanalysis of plasma velocities and magnetic fields measured during thecrossings. In order to improve the overall consistency between multi-and single-spacecraft results, we have also explored the use of hybridtechniques, in which timing information from the four spacecraft is combinedwith certain limited results from single-spacecraft methods, the remainingresults being left for consistency checks.The results show good agreement between magnetopause orientations derived fromappropriately chosen single-spacecraft techniques and those obtained frommulti-spacecraft timing. The agreement between magnetopause speeds derived fromsingle- and multi-spacecraft methods is quantitatively somewhat less good but it isevident that the speed can change substantially from one crossing to the nextwithin an event. The magnetopause thickness varied substantially fromone crossing to the next, within an event. It ranged from 5 to 10 ion gyroradii.The density profile was sharper than the magnetic profile: most of the densitychange occured in the earthward half of the magnetopause.  <b>Key words.</b> Magnetospheric physics (magnetopause, cuspand boundary layers; instruments and techniques) – Spaceplasma physics (discontinuities

Four-spacecraft determination of magnetopause orientation, motion and thickness: comparison with results from single-spacecraft methods