served for three years. From 1971 until 1980 In 1971, Edmonton adopted a ward system in which three aldermen would be elected from each of four wards. Each ward was a north–south slice of the city so each contained territories on both sides of the river. Still the mayor and the councillors were to serve for three years. 1968 The 1968 Edmonton city election was different from the one before and the one after. Like the 1966 election the mayor and all the city councillors were up for election, councillors elected at large through Block Voting. But unlike 1968 they were to serve for three years. In 1968 Alberta's legislation had been changed to require elections every three years in all of the province's municipalities. From 1964 until 1966 In 1964 two new aldermanic positions were added, bringing the total to twelve. As well Edmonton unstaggered its terms for city officials, meaning that all the council seats would be up for election each election, held every two years. In preparation for this, in 1964 the mayor and all aldermanic positions up for re-election were elected to one-year terms. All alderman continued to be elected at-large through block voting. From 1948 until 1963 In 1948, the mayor began to be elected for a two-year term, with annual elections still used to elect half the council each year through Block Voting. The council continued to be elected at-large to staggered two-year terms until 1963, when the council seats up for election were filled just for one year (to prepare for the change in 1964 to all seats being up for election each election. From 1912 to 1960, seats were guaranteed to southsiders. The guaranteed representation for the southside was cancelled after a 1960 referendum. (But in 1971 with the introduction of wards altogether south of the river, southside representation was re-established.) From 1928 until 1947 In this period, following a referendum in 1927, the city returned to using block voting to elect councillors at-large (in one city-wide district). Aldermen continued to be elected on staggered two-year terms, but the mayor was elected for a one-year term. There was still guaranteed minimum representation for the south side of the North Saskatchewan River. This number increased over time. It was two until 1936, and three thereafter. From 1923 until 1927 In this period, following a successful referendum in 1922, the city used Single Transferable