Preparing the descriptions of your occupations, volunteer positions, projects, and other relevant activities is one of the most challenging aspects of writing a resume. Your employment background and volunteer experience should be clearly and succinctly described. A potential employer should be able to determine your duties, talents, areas of strength, and accomplishments after reading your description.

You can use the following advice to produce a succinct and detailed description:

• The place name, location, dates, and job title should be stated at the beginning of each item (e.g. manager, volunteer). You should make a list of your experiences in reverse time (most current experience first).
• You should make succinct assertions about your duties, headed by powerful verbs. Concentrate on the abilities and qualities you have that you have recognized as crucial to your industry. You also ought to try to include keywords that are industry-specific, and clearly demonstrate to potential employers how you will fit both their position and their business. 
• You need to make sure your action words are varied. Your descriptions shouldn't all sound the same. When describing ongoing activities, use the present tense; when describing completed ones, use the past tense.
• Don't use any pronouns and stay away from "I," "and," "the," and prepositions.
• Quantify your tasks and successes wherever you can. For example, "Increased monthly sales by 40%," "Supervised and taught five new employees," "Handled daily receipts totaling $3000," and "Designed 14 costumes for local production" are examples of using numbers, amounts, dollar values, and percentages.
• Keep in mind that you should spell out numerals less than ten and use numeric symbols for numbers greater than ten. There are always exceptions, though.
• A corporation or group you worked with should not have their activities summarized or described. Instead of describing the job or organization itself, describe your duties and successes in connection to it.
• Just include the three or four most crucial things in your description.

Example:

Pennsylvania's The Swim Club

Assistant Manager/Head Lifeguard, Summers 20XX-20XX

• Addressed client concerns and ensured the safety of visitors and clients.
• Six lifeguards were monitored and given the swim club's rules and regulations.
• The timetables for lifeguards, private swim lessons, and pool activities were created and maintained using Excel.
• Helped the management with all facets of the swim club's operations.