The concrete floor slab system shown below is a total service dead load of $(6\mathrm{.}5k\frac{N}{m}2)($including its self$-$weight$)$ and service live load of $(3\mathrm{.}8k\frac{N}{m}2).$ The following design data is given, Flat slab, $h=190mm,$ tdrop $=75mm,f^{\text{'}}c=25$MPa, fy $=350$MPa, use $\frac{O}{?}=12mm$ bars for slab reinforcement.

a$-$ Check the slab for shear requirements

b$-$ Design longitudinal frame of the two$-$way slab for flexure by using direct design method.