For undergrad transfers or a terminal masters applicant, industry recs are generally OK.
For a Ph.D. student, not much more than one industry rec would be commonly permissible, unless they're from an industrial research lab.
For a Ph.D. student, a good industry rec will focus on character, strong work ethic and specific examples of problem-solving ability. Industrial assessment of research potential tends to be mentally damped by the reviewer unless the recommender has a Ph.D.
For undergrad transfers or a terminal masters applicant, industry recs are generally OK.
For a Ph.D. student, not much more than one industry rec would be commonly permissible, unless they're from an industrial research lab.
For a Ph.D. student, a good industry rec will focus on character, strong work ethic and specific examples of problem-solving ability. Industrial assessment of research potential tends to be mentally damped by the reviewer unless the recommender has a Ph.D.