Hi,
Standing Orders are a statutory requirement wherein the organization has 100 or more workmen (in some States 50). Also, Standing Orders are applicable to 'workmen' (as defined under the ID Act). Therefore, they are not applicable to the Supervisory/Executive Cadre.
On the other hand, Standard Operating Procedures (SOPs) apply to 'all' and encompass not only employee-related aspects but also administrative procedures and protocols such as receiving mails/telephone calls, office/filing maintenance, guidelines for receiving guests/visitors, signatory authority, interview board composition, training eligibility criteria, and induction procedures, among others.