1. A method of observation of the execution of a program loaded into an information processing system of the type including the following minimal configuration: a central processing unit, a central memory, one or more input and/or output peripherals exchanging data with the central processing unit, an operating system, optionally one or more application programs, and a service program external to the application program for accessing an observation memory particularly in a reading mode comprising: recording instantaneous information units relating to program being executed and/or the information processing operation context of said program at predetermined points of the information processing system; optionally processing certain of said information units processed by pre-established analysis procedures; memorizing in a status table (TE) and in accordance with a pre-established grid, a selection of, processed and/or unprocessed, information units corresponding to the observed program being executed; authorizing access to the status table (TE), particularly in the reading mode, for service programs (SER) external to the observed program being executed, retaining all or part of the status tables (TE) corresponding to observation cycles preceding the current cycle in memory in accordance with a structure of previous chronologically arranged status tables (TANT1-TANTN), and beginning with the observed application program, automatically loading an address table directly accessible from outside the application program, including the instantaneous addresses of blocks of information relating to the execution of the observed program, in particular an address of a code of a function being executed and an address of the contents of an instantaneous context associated with the function.