A micturition time chart records 'the times of micturitions, day and night, for at least 24 hours' (Abrams et al. 2002), whereas frequency-volume charts record 'the volumes voided as well as the time of each micturition, day and night, for at least 24 hours' (Abrams et al. 2002) and a bladder diary 'records the times of micturitions and voided volumes, incontinence episodes, pad usage and other information such as fluid intake, the degree of urgency and the degree of incontinence' (Abrams et al. 2002). However, the three terms are often used interchangeably in the literature, purely meaning documentation of void time, volume and +/- urgency.