RCC Structures Design
The design of heel slab of a retaining wall is based on the maximum bending moment due to:

All listed here
Its own weight
Load of the surcharge, if any
Weight of the soil above it

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RCC Structures Design
According to I.S. : 456, slabs which span in two directions with corners held down, are assumed to be divided in each direction into middle strips and edge strips such that the width of the middle strip, is

Four-fifth of the width of the slab
Half of the width of the slab
Two-third of the width of the slab
Three-fourth of the width of the slab

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