A computer-implemented method comprising: receiving (202, 302), at a client for use by a user, one or more physiological parameters of the user from one or more devices worn by the user or in proximity to the user in data formats specific to the devices; translating (204, 304), at the client, the received physiological parameters of the user from their respective data formats into a common data format; storing the translated physiological parameters of the user in the common data format at the client; storing the translated physiological parameters of the user in the common data format at a server in association with a user account of the user; receiving, at the client from the user, an indication to share first and second physiological parameters of the user, the indication comprising a first authorization for a first user account to receive the first physiological parameter of the translated physiological parameters and a first time period for the first authorisation, and a second authorization for the second user account to receive a second physiological parameter of the translated physiological parameters and a second time period for the second authorisation, the first and second physiological parameters originating from different devices worn by the user or in proximity to the user; verifying permissions to retrieve the first physiological parameter for the first user account and to retrieve the second physiological parameter for the second user account based on the received first authorization and the second authorization; and instructing, by the client of the user and based on the permissions, the server to store the indication in association with the user account of the user, wherein the server uses the indication when checking whether requests from user accounts for physiological parameters of the user are permitted or authorized by the user account of the user, and when a request from the first user account or second user account is received for physiological parameters of the user, the indication permits the first user account to retrieve the first physiological parameter for the first time period and the second user account to retrieve the second physiological parameter for the second time period, wherein one or more applications display one or more physiological characteristics of the user based on the retrieved physiological parameters. receiving (202, 302), at a client for use by a user, one or more physiological parameters of the user from one or more devices worn by the user or in proximity to the user in data formats specific to the devices; translating (204, 304), at the client, the received physiological parameters of the user from their respective data formats into a common data format; storing the translated physiological parameters of the user in the common data format at the client; storing the translated physiological parameters of the user in the common data format at a server in association with a user account of the user; receiving, at the client from the user, an indication to share first and second physiological parameters of the user, the indication comprising a first authorization for a first user account to receive the first physiological parameter of the translated physiological parameters and a first time period for the first authorisation, and a second authorization for the second user account to receive a second physiological parameter of the translated physiological parameters and a second time period for the second authorisation, the first and second physiological parameters originating from different devices worn by the user or in proximity to the user; verifying permissions to retrieve the first physiological parameter for the first user account and to retrieve the second physiological parameter for the second user account based on the received first authorization and the second authorization; and instructing, by the client of the user and based on the permissions, the server to store the indication in association with the user account of the user, wherein the server uses the indication when checking whether requests from user accounts for physiological parameters of the user are permitted or authorized by the user account of the user, and when a request from the first user account or second user account is received for physiological parameters of the user, the indication permits the first user account to retrieve the first physiological parameter for the first time period and the second user account to retrieve the second physiological parameter for the second time period, wherein one or more applications display one or more physiological characteristics of the user based on the retrieved physiological parameters.