Deciding on the Scale Granularity of Response Categories of Likert Type Scales: The Case of a 21-Point Scale

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Equidistance of Likert-Type Scales and Validation of Inferential Methods Using Experiments and Simulations (2013, background): “Even though the optimal number of steps has been debated over the years (Pearse, 2011), the classical Likert item based on a statement where the subjects are asked to choose one out of five possible degrees of agreement, ranging from ‘strongly agree’ to ‘strongly disagree’, that complies with their…”
Likert Scale: Explored and Explained (2015, background): “Hence this dilemma of forced choosing between two equally undesirable point imposed by the 5-point Likert scale may be addressed up to a extent by offering more choices (in between) by a 7-point scale [22-24].”