Eleven vows (Ekadash vrat) were part of the ethical system prescribed by Mahatma Gandhi mainly for all those residing in the ashram.
[1] A book originally published in Gujarati and later in English titled 'Character And Nation Building' is a summary of 'Ashram observances and constructive programme' discusses these vows.
Gandhi asked for progressive simplication of one's life by renouncing things that one doesn't need.
Fear hinders spiritual progress and therefore observance of this vow was mentioned separately.
In 1915 Gandhi delivered an address to the students at Madras in which he discussed these vows.