Abstract : The four form factors in electron-trinucleon (e-H3 or e-He3) elastic scattering are analyzed using two alternative sets of four unknowns: (i) the neutron electric form factor, the form factor F for the dominant S state and the isovector- and isocalar-exchange magnetic form factors-neglecting the mixed symmetry S' state; (ii) the form factors for odd and like nucleons, and the isovector- and isocalar-exchange magnetic form factors--assuming knowledge of the neutron electric form factor, essentially 0.02 q-squared. The first alternative gives positive neutron electric form factors that seem somewhat high; the second alternative gives a plausible value of 1% for the probability of the mixed-symmetry S' state, and also gives a reasonable shape for the isovector-exchange form factor. The isocalar-exchange form factor stays less than 0.06 nm. Good agreement is found between results for F and calculations based on three different wave functions adjusted to give the experimental Coulomb energy. (Author)