Top Search Engine Marketing (SEM) Agencies
Paid search is one of the fastest ways to put your brand in front of high-intent buyers. The right search engine marketing (SEM) agency can refine your bidding strategy, craft compelling ad copy, and turn clicks into measurable revenue. On Clutch, every provider is evaluated through in-depth client reviews, detailed service questionnaires, and verified performance data, so you can hire with confidence. Use the filters on this page to narrow agencies by budget, location, industry expertise, and more. Looking for regional options? Browse leading SEM agencies in the United States, SEM firms in the United Kingdom, and SEM companies in Canada to find a partner that meets your goals and time zone.
Need a particular expertise in Google Ads? Explore the best Google Ads PPC agencies on Clutch to find the perfect partner.
-
Featured
What are Featured Providers?
$1,000+$100 - $149 / hr250 - 999Paramus, NJServices provided
See all 366 projectsSmartSites is a comprehensive SEO agency that specializes in enhancing digital visibility through services like search engine optimization, PPC, and website updates. With a 100% positive feedback rate, clients consistently praise their timely delivery, responsive communication, and effective SEO strategies. An impressive 40% of reviewers highlighted their strong project management and personal service, underscoring SmartSites' commitment to achieving measurable business growth and online visibility improvements.
-
$5,000+$150 - $199 / hr10 - 49Philadelphia, PA
Services provided
Synergist Digital Media is a pay per click company. Launched in 2015, the company specializes in Pay Per Click and Search Engine Optimization.
Read more -
$10,000+$100 - $149 / hr10 - 49New York, NY
Services provided
See all 1 projectsSavior Marketing is an SEO agency offering services such as search optimization, digital visibility enhancement, and website SEO services. However, client feedback indicates significant issues with project management, communication, and accountability, with 100% of reviewers reporting negative experiences, including a hacked website and lack of control over digital assets.
-
UndisclosedUndisclosedFreelancerJohannesburg, South Africa
Services provided
See all 1 projectsD Web Dev Marketing is a full-service digital marketing and web design agency based in Johannesburg, South Africa. We specialize in delivering strategic and creative solutions that empower small and
Read more -
Undisclosed$25 - $49 / hr50 - 249Pune, India
Services provided
Launched in 2017, Cling Multi Solutions Pvt. Ltd. Is a social media marketing company. The team provides Social Media Marketing and Search Engine Optimization.
Read more -
Undisclosed$100 - $149 / hr2 - 9Novi, MI
Services provided
Based in Novi, Michigan, Blue Lake Web Design is a SEO agency. The team focuses on Search Engine Optimization and Web Design.
Read more -
Undisclosed< $25 / hr10 - 49Greater Noida, India
Services provided
See all 1 projectsMarketing Savvy offers comprehensive services including website development, SEO, SEM, SMM, and email marketing. Their clients laud the company for significantly enhancing online visibility and website ranking, with marked improvements in search traffic and lead generation. Marketing Savvy is praised for their expertise, responsiveness, and alignment with client values, despite some minor concerns over cost.
-
$1,000+$25 - $49 / hr10 - 49Izmir, Türkiye
Services provided
Venüs Ajans (Venus Digital Agency) is a small social media marketing agency. Launched in 2007, the team focuses on Social Media Marketing and Web Design.
Read more -
$1,000+< $25 / hr10 - 49New Delhi, India
Services provided
HostShop, a web design company, is located in New Delhi, India. The team specializes in Web Design and Search Engine Optimization.
Read more -
UndisclosedUndisclosed10 - 49Singapore, Singapore
Services provided
Pay per click agency RIFF APAC PTE LTD is headquartered in Singapore, Singapore. The team specializes in Pay Per Click and Content Marketing.
Read more -
$1,000+$25 - $49 / hr10 - 49Vasai-Virar, India
Services provided
DG7 Solutions Private Limited is a Digital Strategy company. The small Vasai-Virar, India-based team focuses on Digital Strategy and Pay Per Click. The firm was founded in 2012.
Read more -
$5,000+$50 - $99 / hr10 - 49München, Germany
Services provided
Founded in 2015, AMZ Controlling is a small Business Consulting company. Their services include Business Consulting and Pay Per Click.
Read more -
$5,000+$100 - $149 / hr10 - 49Miami, FL
Services provided
ALH Media is a SEO agency. Launched in 2010, the company is headquartered in Miami, Florida. Their services include Search Engine Optimization and Content Marketing.
Read more -
$1,000+< $25 / hr10 - 49Chennai, India
Services provided
GML Soft Labs is a SEO company. The company is based in Chennai, India. Their team specializes in Search Engine Optimization and Web Development.
Read more -
$1,000+Undisclosed10 - 49Bengaluru, India
Services provided
GA Digital Media Solutions is a SEO company. Their team is in Bengaluru, India and specializes in Search Engine Optimization and Pay Per Click.
Read more -
$1,000+$25 - $49 / hr10 - 49Chennai, India
Services provided
W3Squad Digital Marketing Chennai is a small Content Marketing company launched in 2019. Their services include Content Marketing and Pay Per Click.
Read more -
$1,000+$25 - $49 / hr10 - 49Bhopal, India
Services provided
Content Marketing company TheConversions Digitech Private Limited is in Bhopal, India. Established in 2010, the team provides Content Marketing and Search Engine Optimization.
Read more -
Undisclosed< $25 / hr10 - 49Hyderabad, India
Services provided
UMDAA Healthcare is a SEO company. Established in 2016, the firm is located in Hyderabad, India. Their team specializes in Search Engine Optimization and Social Media Marketing.
Read more -
$1,000+< $25 / hr10 - 49Bekasi, Indonesia
Services provided
Social media marketing firm Digital Agency ID provides Social Media Marketing and Search Engine Optimization. They are based in Bekasi, Indonesia and Bekasi, Indonesia.
Read more -
$10,000+$100 - $149 / hr10 - 49Dubai, United Arab Emirates
Services provided
Established in 2019, VOUS Digital Marketing, a small Conversion Optimization company, is based in Dubai, United Arab Emirates. Their services include Conversion Optimization and Pay Per Click.
Read more -
$5,000+$150 - $199 / hr10 - 49Kolkata, India
Services provided
Digital Lead Group is a SEO services firm established in 2020. Headquartered in Kolkata, India, the team specializes in Search Engine Optimization and Social Media Marketing.
Read more -
$1,000+< $25 / hr10 - 49Jaipur, India
Services provided
Based in Jaipur, India and Bengaluru, India, Agha DigiTech is a Content Marketing company. Their services include Content Marketing and Search Engine Optimization.
Read more -
$1,000+Undisclosed10 - 49Dokki, Egypt
Services provided
Founded in 2018, InnGlo is a small Marketing Strategy company. Their team provides Marketing Strategy and Search Engine Optimization.
Read more -
$1,000+$50 - $99 / hr10 - 49Hyderabad, India
Services provided
Digitoze is a Hyderabad, India-based social media marketing company. Launched in 2018, the team offers Social Media Marketing and Digital Strategy.
Read more -
$1,000+$25 - $49 / hr10 - 49
Services provided
AT Digital is a PPC agency. Their small team is located in Singapore, Singapore and Maharagama, Sri Lanka and provides Pay Per Click and Social Media Marketing. The agency was founded in 2017.
Read more -
$1,000+$25 - $49 / hr10 - 49
Services provided
Ravs IT Solution is a PPC agency. Founded in 2020, the agency is located in Morley, Australia. Their services include Pay Per Click and Email Marketing.
Read more -
$1,000+$100 - $149 / hr10 - 49Bothell, WA
Services provided
Easy As Pie is a Content Marketing company. Founded in 2015, the company specializes in Content Marketing and Search Engine Optimization.
Read more -
Undisclosed< $25 / hr10 - 49
Services provided
SEO company NeXT Digital Web is based in Kolkata, India and Midnapore, India. They offer Search Engine Optimization and Social Media Marketing.
Read more -
UndisclosedUndisclosed10 - 49Mumbai, India
Services provided
Infozzle Software Solution Pvt Ltd is a web design company. The agency is based in Mumbai, India. Their team provides Web Design and Pay Per Click.
Read more -
UndisclosedUndisclosed10 - 49Pune, India
Services provided
Kubera Communications is a Digital Strategy company. Their small team is headquartered in Pune, India. Their services include Digital Strategy and Social Media Marketing.
Read more -
UndisclosedUndisclosed10 - 49Kakkanad, India
Services provided
ILLFORD DIGITAL, a branding company, was established in 2012. The small team specializes in Branding and Search Engine Optimization.
Read more -
$1,000+$100 - $149 / hr10 - 49
Services provided
In Casper, Wyoming, Advance Amazon is a Marketing Strategy company. Their services include Marketing Strategy and Pay Per Click.
Read more -
$1,000+$25 - $49 / hr10 - 49Bengaluru, India
Services provided
Web Converts, a SEO services firm, was founded in 2019. Based in Bengaluru, India, the team focuses on Search Engine Optimization and Web Development.
Read more -
$1,000+$50 - $99 / hr10 - 49Milton, Australia
Services provided
Priority1 Marketing is a Digital Strategy company launched in 2021. The team offers Digital Strategy and Search Engine Optimization and is in Milton, Australia.
Read more -
$1,000+$100 - $149 / hr10 - 49Istanbul, Türkiye
Services provided
3GEN Digital Growth Agency is a Conversion Optimization company. They were established in 2020 and provide Conversion Optimization and Media Planning & Buying.
Read more -
$1,000+$25 - $49 / hr10 - 49
Services provided
Social media marketing company human rewriters is in CA, Arkansas. They focus on Social Media Marketing and Search Engine Optimization.
Read more -
$1,000+< $25 / hr10 - 49
Services provided
Click Dribble - Best Digital Marketing & SEO Agency in Nepal is a social media marketing company in Kathmandu, Nepal. Launched in 2023, the team offers Social Media Marketing and Pay Per Click.
Read more -
$1,000+$25 - $49 / hr10 - 49Chennai, India
Services provided
Brand Mindz Global Technology Pvt Ltd, a Performance Marketing company, is in Chennai, India and Tirunelveli, India. The team offers Performance Marketing and Search Engine Optimization.
Read more -
$5,000+$100 - $149 / hr10 - 49
Services provided
SEO agency Pyrite Technologies was founded in 2012. The small team offers Search Engine Optimization and Web Development.
Read more -
$1,000+$25 - $49 / hr10 - 49Lekki, Nigeria
Services provided
Busnurd Technologies is a SEO services firm. Their team is located in Lekki, Nigeria. The company specializes in Search Engine Optimization and Marketing Strategy.
Read more -
$1,000+$50 - $99 / hr10 - 49
Services provided
Studio 53 is a Content Marketing company. They are based in Chennai, India. Their team offers Content Marketing and Social Media Marketing.
Read more -
$1,000+$25 - $49 / hr10 - 49
Services provided
DON Digital is a SEO company. They are in Sibiu, Romania and have small team of experts. Their services include Search Engine Optimization and Social Media Marketing.
Read more -
$1,000+< $25 / hr10 - 49Bengaluru, India
Services provided
Surya SEO is a SEO agency. Founded in 2021, the firm is based in Bengaluru, India. Their team specializes in Search Engine Optimization and Other Digital Marketing.
Read more -
UndisclosedUndisclosed10 - 49
Services provided
Virtual Softech is a web design company. The team specializes in Web Design and Search Engine Optimization, and the agency is based in Coimbatore, India.
Read more -
$1,000+< $25 / hr2 - 9
Services provided
See all 1 projectsMAXIMA GROWTH offers SEO and social media marketing services aimed at driving business growth. The overall feedback from reviews highlights their ability to deliver promised results and generate significant sales increases. Clients commend MAXIMA GROWTH for their effective project management and timely delivery of services, establishing them as a highly recommended digital marketing agency.
-
$1,000+< $25 / hr2 - 9Nairobi, Kenya
Services provided
See all 1 projectsArilan Media provides services in website design, lead generation, and search engine marketing, contributing to enhanced online visibility and improved website ranking. The reviews highlight the company's effective project management, exceptional customer service, and successful lead generation results, particularly in the real estate sector. Clients commend their responsiveness and value-for-cost proposition, indicating significant satisfaction with Arilan Media's offerings.
-
$1,000+$50 - $99 / hr2 - 9Charlotte, NC
Services provided
Cloud Digital is a small web design company. They provide Web Design and Search Engine Optimization and were established in 2017.
Read more -
$25,000+$100 - $149 / hr10 - 49Delhi, India
Services provided
See all 1 projectsSoftonic Solution offers website design services, specializing in interactive and well-managed projects. Client reviews highlight their effective communication, timely completion using emails and spreadsheets, and exceptional client relations, particularly noting their politeness and proactive feedback-seeking approach which ensures project success.
-
$1,000+Undisclosed10 - 49دبي, United Arab Emirates
Services provided
See all 1 projectsMindstorm Global Technologies LLC specializes in website and mobile app development, offering digital solutions tailored to enhance business needs. Reviews highlight their commitment to client satisfaction, high-quality products, and innovation. Clients appreciate their effective project management and value alignment, with an emphasis on delivering user-friendly and visually appealing digital products on time.
-
$1,000+< $25 / hr10 - 49
Services provided
Zeal Digital Agency, a SEO agency, offer Search Engine Optimization and Digital Strategy. They were launched in 2019.
Read more -
UndisclosedUndisclosed10 - 49
Services provided
JB Tech Solutions is a small PPC company established in 2017. Their services include Pay Per Click and Logo.
Read more
Share your project goals, and we’ll connect you with verified partners who fit your budget and timeline.
Get My Matches
Tell us what you need — we’ll match you with top agencies in minutes.
Get My MatchesWhy Trust Clutch
At Clutch, we believe trust is the foundation of every business relationship. Our mission is to help buyers make confident, data-backed decisions informed by real client experiences.
Every review on Clutch undergoes a rigorous, human-led verification process to make sure it’s valid. Our team of specialists confirms the identity of each reviewer, ensures the project is legitimate, and only publishes reviews that meet our strict criteria.
Verification doesn’t stop at the point of publication. Our Trust & Safety team routinely audits older reviews against our guidelines. When reviews fall short of our standards, we remove them.
We evaluate service providers using a structured methodology that combines:
- In-depth client interviews and ratings
- Comprehensive project details
- Market presence
- Portfolio examples and industry recognition
This data powers tools like the Leaders Matrix, which helps you compare agencies directly. Our research team curates rankings by weighing verified reviews most heavily, so the most trusted and experienced providers rise to the top.
Using this unique combination of verified client feedback and provider-supplied insights, Clutch distills the most important details into clear, digestible summaries so you have everything you need to make confident, informed decisions quickly.
We take fraud seriously. Providers who violate our guidelines may face lower rankings, restricted visibility, or removal from the platform altogether.
Clutch’s commitment to transparency is ongoing. We’re constantly refining our systems to protect the integrity of reviews and support you in finding the right agency.
Compare Top 15 Search Engine Marketing (SEM) Agencies
-
$1,000+$100 - $149 / hr250 - 999Paramus, NJ
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
50% Search Engine Optimization30% Pay Per Click20% Other -
$1,000+$100 - $149 / hr50 - 249Costa Mesa, CA
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
10% Search Engine Optimization60% Pay Per Click30% Other -
$1,000+$150 - $199 / hr50 - 249Toronto, Canada
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
70% Search Engine Optimization20% Pay Per Click10% Other -
$1,000+$100 - $149 / hr250 - 999San Diego, CA
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
40% Search Engine Optimization10% Pay Per Click50% Other -
$1,000+$150 - $199 / hr250 - 999Copley, OH
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
45% Search Engine Optimization25% Pay Per Click30% Other -
$5,000+$150 - $199 / hr50 - 249Marion, IL
Ability to deliver
39.8/40.020/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
70% Search Engine Optimization10% Pay Per Click20% Other -
$1,000+$100 - $149 / hr50 - 249Los Angeles, CA
Ability to deliver
39.7/40.020/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
40% Search Engine Optimization50% Pay Per Click10% Other -
$5,000+$150 - $199 / hr10 - 49Toronto, Canada
Ability to deliver
39.6/40.020/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
75% Search Engine Optimization10% Pay Per Click15% Other -
$1,000+$25 - $49 / hr250 - 999Arlington Heights, IL
Ability to deliver
39.6/40.020/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
40% Search Engine Optimization30% Pay Per Click30% Other -
$1,000+Undisclosed50 - 249Colorado Springs, CO
Ability to deliver
39.4/40.019.4/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
70% Search Engine Optimization30% Pay Per Click -
$1,000+$100 - $149 / hr50 - 249Bel Air, MD
Ability to deliver
39.3/40.020/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
20% Search Engine Optimization50% Pay Per Click30% Other -
$1,000+$100 - $149 / hr10 - 49Tampa, FL
Ability to deliver
39.1/40.019.4/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
70% Search Engine Optimization30% Pay Per Click -
$10,000+Undisclosed250 - 999New York, NY
Ability to deliver
39.1/40.019.8/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
15% Search Engine Optimization85% Pay Per Click -
$1,000+$150 - $199 / hr10 - 49New York, NY
Ability to deliver
39/40.020/20 Reviews9.6/10 Clients & Experience9.5/10 Market PresenceService focus
10% Search Engine Optimization80% Pay Per Click10% Other -
$1,000+$100 - $149 / hr10 - 49South Jordan, UT
Ability to deliver
39/40.019.4/20 Reviews9.9/10 Clients & Experience9.7/10 Market PresenceService focus
65% Search Engine Optimization25% Pay Per Click10% Other -
$1,000+$50 - $99 / hr50 - 249San Antonio, TX
Ability to deliver
39/40.020/20 Reviews9.2/10 Clients & Experience9.7/10 Market PresenceService focus
70% Search Engine Optimization10% Pay Per Click20% Other -
$1,000+$25 - $49 / hr50 - 249Sahibzada Ajit Singh Nagar, India
Ability to deliver
38.6/40.019.2/20 Reviews10/10 Clients & Experience9.4/10 Market PresenceService focus
55% Search Engine Optimization15% Pay Per Click30% Other -
$1,000+$100 - $149 / hr10 - 49Boca Raton, FL
Ability to deliver
39.5/40.020/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
60% Search Engine Optimization20% Pay Per Click20% Other -
$1,000+$50 - $99 / hr50 - 249Los Angeles, CA
Ability to deliver
38.6/40.020/20 Reviews9/10 Clients & Experience9.6/10 Market PresenceService focus
70% Search Engine Optimization10% Pay Per Click20% Other -
$1,000+$25 - $49 / hr250 - 999
Ability to deliver
38.6/40.019/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
25% Search Engine Optimization25% Pay Per Click50% Other -
$1,000+$50 - $99 / hr50 - 249L'viv, Ukraine
Ability to deliver
38.5/40.020/20 Reviews10/10 Clients & Experience8.5/10 Market PresenceService focus
80% Search Engine Optimization10% Pay Per Click10% Other -
$1,000+$25 - $49 / hr250 - 999Pearland, TX
Ability to deliver
38.3/40.020/20 Reviews9.7/10 Clients & Experience8.6/10 Market PresenceService focus
35% Search Engine Optimization20% Pay Per Click45% Other -
$1,000+$100 - $149 / hr50 - 249Chicago, IL
Ability to deliver
38.1/40.018.2/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
70% Search Engine Optimization25% Pay Per Click5% Other -
$1,000+$100 - $149 / hr50 - 249Lehi, UT
Ability to deliver
38.1/40.018.2/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
75% Search Engine Optimization25% Pay Per Click -
$1,000+$100 - $149 / hr250 - 999Odesa, Ukraine
Ability to deliver
38.1/40.018.4/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
40% Search Engine Optimization30% Pay Per Click30% Other -
$1,000+$50 - $99 / hr50 - 249Odesa, Ukraine
Ability to deliver
38.1/40.018.4/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
60% Search Engine Optimization30% Pay Per Click10% Other -
$5,000+$100 - $149 / hr10 - 49London, England
Ability to deliver
37.9/40.018.2/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
50% Search Engine Optimization50% Pay Per Click -
$5,000+$100 - $149 / hr50 - 249Huntington, NY
Ability to deliver
37.8/40.018.4/20 Reviews10/10 Clients & Experience9.4/10 Market PresenceService focus
20% Search Engine Optimization50% Pay Per Click30% Other -
$5,000+$100 - $149 / hr10 - 49Calgary, Canada
Ability to deliver
37.7/40.020/20 Reviews10/10 Clients & Experience7.7/10 Market PresenceService focus
45% Search Engine Optimization40% Pay Per Click15% Other -
$5,000+$200 - $300 / hr50 - 249Chicago, IL
Ability to deliver
37.5/40.019/20 Reviews10/10 Clients & Experience8.5/10 Market PresenceService focus
40% Search Engine Optimization45% Pay Per Click15% Other
Top Search Engine Marketing (SEM) Agencies
An SEM company plans, launches, and manages paid search campaigns on platforms such as Google Ads, Microsoft Advertising, and Amazon. Their specialists research high-value keywords, write ad copy, set up audience targeting, adjust bids in real time, and run A/B tests to maximize return on ad spend (ROAS). They also track conversions, deliver performance reports, and provide strategic recommendations that align with your wider digital marketing objectives.
Most agencies deliver an end-to-end suite that can include:
- Keyword research & competitive analysis
- Campaign setup (Search, Shopping, Display, YouTube)
- Bid management and budget pacing
- Ad copywriting and creative testing
- Landing-page optimization
- Remarketing and audience segmentation
- Conversion tracking and analytics integration
Some firms also bundle complementary channels, such as programmatic display or social PPC, to create a unified digital marketing strategy.
SEM engagements usually fall between $3,000–$20,000 per month, but pricing scales with ad spend, account complexity, and service level. Smaller businesses might work with an agency on a management-fee model (e.g., 10%–20% of monthly media spend), while enterprises often negotiate flat retainers or performance-based contracts. Always ask for a clear breakdown of management fees versus ad budget before signing.
Start by defining your KPIs, such as lead volume, e-commerce revenue, or customer acquisition cost. Then:
- Review case studies in your industry.
- Check Clutch client reviews for transparency, communication, and results.
- Compare pricing models (percentage of spend, flat fee, or hybrid).
- Request a campaign audit or strategic roadmap to gauge expertise.
Selecting a partner whose reporting cadence and collaboration style match your internal workflow will set the engagement up for success.
- “Guaranteed #1 ranking” claims (ad position depends on auction dynamics).
- Lack of access to the ad account or data ownership.
- Vague reporting that focuses on clicks instead of revenue-driven metrics.
- One-size-fits-all strategies with minimal keyword research.
- Slow or inconsistent communication during the sales process.
- How will you structure our campaigns and why?
- Which metrics will you report on weekly and monthly?
- What tools or automations do you use for bid management?
- Can you share a recent success story in a similar industry or budget range?
- Who will be my day-to-day point of contact, and how many accounts do they manage?
- How do you coordinate SEM with SEO and other digital marketing channels?
Agencies bring platform certifications, cross-account data, and advanced tools that small teams can’t always justify purchasing. Their experience shortens the testing cycle, reduces wasted spend, and frees internal staff to focus on broader marketing initiatives.
Freelancers are ideal for limited budgets or project-based needs. Agencies, however, provide a multidisciplinary team including strategists, copywriters, designers, and analysts that can scale campaigns quickly and cover absences without interrupting performance.