  A new phenomenological approach is suggested for determining the strangeness
content of light-flavour isoscalars. This approach is based on phenomenological
laws of hadron production related to the spin, isospin, strangeness content and
mass of the particles. From the total production rates per hadronic Z decay of
all light-flavour hadrons, measured so far at LEP, the values of the
nonstrange-strange mixing angles are found to be |\phi_P| = 42.3^{\circ} \pm
3.5^{\circ}, |\phi_V| = 10^{\circ} \pm 8^{\circ}, |\phi_T| = 16^{\circ} \pm
11^{\circ} and |\phi_S| = 13^{\circ} \pm 9^{\circ}. Our results on the
\eta-\eta^{\prime}, \omega-\phi and f_2-f_2^{\prime} isoscalar mixing are
consistent with the present experimental evidence. The strangeness content
obtained for the f_0(980) scalar/isoscalar is not consistent with the values
supported by recent model studies and is discussed further in the framework of
our approach and the K-matrix analysis.
