Abstract: A system, method and computer program product for performing detailed planning functions for businesses, enterprises and other types of organizations. According to an embodiment, the system comprises a graphical user interface configured to allow a user to define calculations based on data associated with an entity that may have scalar attributes for each entity, and/or a time series, and execution of the defined calculation generates time series result. According to another aspect, a calculation definition may be configured to be adjustable allowing a user to adjust parameter value(s) for each entity associated with the calculation definition. According to another aspect, a calculation definition may be configured to be discretionary allowing a user to attach or assign a calculation to each entity individually. According to another aspect, multiple calculations may be created and have the same name.