"The role of the sheriff saw the most important changes in English local government in the period 1066-1215" How far do you agree with this statement?

Intro: (Present factors you will be using in the order you will address them and state your argument) The role of the sheriff fluctuated dependent on kingship; but a general trend saw their duties placed under greater scrutiny, with certain powers supressed throghout the period 1066-1215. However, similar constraints and reduced military and political power can be identified in the role of the Earl, making a general increase in centralisation the most important change to English central government between 1066-1215. 

Follow with 3 paragraphs each addressing an individual factor (Role of the Sheriff, Role of the Earl, Centralisation of Government): Example: Role of the sheriff: Whilst certain reigns indicated increased powers to local administrators, throughout the period there was a trend of reducing and contraining the sheriffs' power and authroity in both their financial and judicial roles between 1066-1215. Financial Duties Changes: given responsibilty of assessing and collecting taxes, Exchequer (1110) increased scrutiny on sherriffs' tax collections and Pipe Rolls professionalised the process of recording sheriff activity and financial collections. Judicial Duty Changes: Itinerant Justices/Justices in Eyre introduced royal administration into localities, Standardised law in Assize of Clarendon and Northampton (1166). HOWEVER (counter-argument) the frequency of these general eyres meant that customary law and the ultimate judgement of the sheriff was still highly regarded within the locality (+ election of 12 local jurymen in local courts)- William I and Stephen's reign saw Earldoms come back into prominance (increased by 12 from 35-54) Power/Authority changes: Writ of 1108= giving commands to sherrifs, Inquest of Sheriffs (1170) 22/29 dismissed, Robert of Marmion fined £1000 in 1190= harsher punishments on disobedient sherrifs. 

In each paragraph present point - counterpoint structure ending with a mini-conclusion which always uses the wording of the question, ranks the factor in order of significance and links into the next question. The conclusion should never introduce new information, rank the factors in order of significance and summarise the main thread of your argument in a succinct and confident manner.