A system comprising: a first memory having a first capacity; a second memory having a second capacity, the second capacity being greater than the first capacity; one or more processors coupled to the first and second memories (411, 421), the one or more processors being configured to retrieve and store items in memory in accordance with instructions causing the one or more processors to: receive a request for a given item of information, and in response to receiving the request: retrieve the given item from the first memory when the given item is stored in the first memory; retrieve the given item from the second memory when the given item is stored in the second memory; determine a priority value for the given item and each item from a plurality of items of information in the first memory, the priority value defined as: E n = − 1 * ALPHA*LS n + 1 − ALPHA * E n − 1, where: "n" represents the n th occurrence of a request for the given item; "E n " represents the priority value at the n th occurrence of the request for the given item; "LS n " represents the amount of time that elapsed between the n th occurrence of the request for the given item and the previous request for the given item; and "ALPHA" represents a value between 0 an 1, including 1; and store the given item in the first memory when (i) the given item has been previously requested, and (ii) the priority value of the given item is greater than the priority value of at least one other item selected from the plurality of items; wherein the first memory has a first access time, the second memory has a second access time, and the first access time is less than the second access time. a first memory having a first capacity; a second memory having a second capacity, the second capacity being greater than the first capacity; one or more processors coupled to the first and second memories (411, 421), the one or more processors being configured to retrieve and store items in memory in accordance with instructions causing the one or more processors to: receive a request for a given item of information, and in response to receiving the request: retrieve the given item from the first memory when the given item is stored in the first memory; retrieve the given item from the second memory when the given item is stored in the second memory; determine a priority value for the given item and each item from a plurality of items of information in the first memory, the priority value defined as: E n = − 1 * ALPHA*LS n + 1 − ALPHA * E n − 1, where: "n" represents the n th occurrence of a request for the given item; "E n " represents the priority value at the n th occurrence of the request for the given item; "LS n " represents the amount of time that elapsed between the n th occurrence of the request for the given item and the previous request for the given item; and "ALPHA" represents a value between 0 an 1, including 1; and store the given item in the first memory when (i) the given item has been previously requested, and (ii) the priority value of the given item is greater than the priority value of at least one other item selected from the plurality of items; receive a request for a given item of information, and in response to receiving the request: retrieve the given item from the first memory when the given item is stored in the first memory; retrieve the given item from the second memory when the given item is stored in the second memory; retrieve the given item from the first memory when the given item is stored in the first memory; retrieve the given item from the second memory when the given item is stored in the second memory; determine a priority value for the given item and each item from a plurality of items of information in the first memory, the priority value defined as: E n = − 1 * ALPHA*LS n + 1 − ALPHA * E n − 1, where: "n" represents the n th occurrence of a request for the given item; "E n " represents the priority value at the n th occurrence of the request for the given item; "LS n " represents the amount of time that elapsed between the n th occurrence of the request for the given item and the previous request for the given item; and "ALPHA" represents a value between 0 an 1, including 1; and "n" represents the n th occurrence of a request for the given item; "E n " represents the priority value at the n th occurrence of the request for the given item; "LS n " represents the amount of time that elapsed between the n th occurrence of the request for the given item and the previous request for the given item; and "ALPHA" represents a value between 0 an 1, including 1; and store the given item in the first memory when (i) the given item has been previously requested, and (ii) the priority value of the given item is greater than the priority value of at least one other item selected from the plurality of items; wherein the first memory has a first access time, the second memory has a second access time, and the first access time is less than the second access time.