ACAS have published new guidance on how to carry out workplace investigations with some useful reminders for employers. Carrying out a proper and thorough investigation is crucial before taking disciplinary action against an employee or deciding an employee's grievance. Paying only cursory attention to this stage can often be the downfall of what might have otherwise been a sound basis for disciplinary action or for a decision to uphold a grievance. Ultimately, in the event of a tribunal claim for unfair dismissal a poor investigation can result in a finding of procedural or even substantive unfairness against an employer. Therefore employers should pay keen attention to this important stage of a disciplinary and grievance process and would be wise to seek appropriate legal advice to ensure the requirements of a proper investigation process are satisfied.