Apparatus and methods for helping a user establish values (e.g. timings) for a plurality of parameters of interest (e.g. cell divisions) relating to the development of an embryo from a series of images of the embryo are described. For each parameter of interest an image is selected for display to a user seeking to establish a value for the parameter of interest. For example, the selected image may be an image predicted to be an image reflecting the value for the parameter of interest. For example, the selected image may be based on a calculated timing for a particular developmental event. The timing may be calculated from a numerical analysis of the images or maybe predetermined. If the user is unable to determine a value for the parameter of interest from the selected image, the user may scroll through neighboring images until the user can determine a value for the parameter of interest. A value for the proud of interest may then be established in response to user input, for example a user providing an indication that a timing associated with a currently displayed image from the series of images should be taken to be the value of the parameter of interest. The different parameters of interest may be established in an iterative manner in which an initial image for display to a user is selected for each parameter of interest based on the parameter of interest.