Alter Self

School transmutation (polymorph)
Level Bard 2, Sorcerer/Wizard 2
Casting Time 1 standard action
Components V, S, M (a piece of the creature whose form you plan to assume)
Range personal
Target you
Duration 1 min./level (D)

When you cast this spell, you can assume the form ofr Medium creature of the humanoid type. If the form you assume has any of the following abilities, you gain the listed ability: darkvision 60 feet, low-light vision,and swim 30 feet.

Small creature: If the form you take is that of a Small humanoid, you gain a +2 size bonus to your Dexterity.

Medium creature: If the form you take is that of a Medium humanoid, you gain a +2 size bonus to your Strength.

Does this stack with enlarge and reduce person?

No it doesn't

You can only be affected by one polymorph spell at a time. If a new polymorph spell is cast on you (or you activate a polymorph effect, such as wild shape), you can decide whether or not to allow it to affect you, taking the place of the old spell. In addition, other spells that change your size have no effect on you while you are under the effects of a polymorph spell.

does a person's size modifiers for CMB and CMD change?

No it doesn't see text of Reduce person and Enlarge Person this is not the same as those spells.

With that said if your a medium creature and change to a medium creature you do not get the +2 bonus to str same applies to small to small.

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