The terminology used "Staff" is vague and it needs clarification. Absenteeism is to be seen in three different levels: (i) Long-unauthorized absence (ii) Intermittent and habitual absence, where the number of days of absence on any one occasion does not exceed a few days (iii) absence leading to the conclusion that someone has abandoned his job with the company. In all cases, summary dismissal is neither warranted nor supported in law. Employers have to give a reasonable opportunity to the erring employee to give an explanation in writing - which has to be dealt with according to the merits of each situation.
For the class of employees who would be treated as "Workmen," the provisions of charge sheeting, domestic enquiry, findings, etc., should precede the award of punishment. If Standing Orders are applicable, the processes as laid down in the Standing Orders must be strictly adhered to if one wants to make it foolproof in terms of a potential challenge. However, if the employee is not a workman, then the Terms of employment as stated in the contract of employment would take precedence. Even if the contract includes summary dismissal provisions for certain misconduct, it would be better to seek an explanation through a Show-cause notice. Even a mere telegram conveying intent is adequate. If any explanation is received at all, then an enquiry could be conducted depending on the terms of the contract and evidence recorded as part of the proceedings.
Finally, the order of dismissal can be passed if needed. If an employee does not show up for an enquiry or to give an explanation, make a couple of more efforts on the record to show that you have tried to reach him and give him an extension of time for the submission of an explanation on a suo motu basis. If all efforts fail, have an ex parte enquiry and then deliver the punishment. Remember, punishment must be proportionate to the misconduct. In a L&T Komatsu versus one of its employees, an employee who had been dismissed on account of habitual absence has been upheld as valid by the Hon'ble Supreme Court. There are several similar decisions. Courts are not inclined these days to let habitual absentee free of punishment. However, give a reasonable and fair opportunity.
EIRVALSA