Applicants must be permitted to familiarise themselves with the materials related to their complaints and appeals. Where they complain to an election commission, they must be informed of the time and the date of the session at which their complaint will be considered so that they can attend the session. Similarly, assistance for the presentation of complaints should be ensured to complainants. Complaints on voter registration or the right to vote on election day are usually not complicated neither legally nor in fact. In such issues, an oral complaint might be acceptable. In other cases where the dispute is more detailed and legally complex and requiring an investigation of factual circumstances, a written form might be suitable. In most countries, a written form for the complaint is necessary. In some countries, an oral complaint is possible, depending on the type of complaint lodged.