Sometimes the readers might want to master fully the material in a book , journal article or manual so that they can evaluate its arguments, perspective, and/or evidence. This will require to read the material thoroughly , make effective and relevant notes, keep an open mind by being aware of their own ideas and opinions regarding the issues involved , reading to critically evaluate . With this purpose , readers may want to judge an author’s ideas and express their opinion . General speaking, readers are able to criticize what they read. However , readers need to read with an open mind before criticizing that matter.