Personal study and research requires Concentration.
Unfettered Casting gains a caster an extra measure of of Concentration.Conviction can also increase Concentration, but only in regards to effects that target other followers of the same faith.
Concentration Agency: Divine Avatar, Divine Agents, and Familiars can, with the right Ritual/Rite and/or Offering, provide agency for the control of a SummoningsSummoning[/su_permalink type spell. Basically, the agent gives up their own actions to control that of another. Agency can only be used on targets where complete control is already established. Agents cannot have targets perform actions which will cause control to be broken.