Php ajax live data jobs

I'm in the market for a talented video creator who can skillfully produce a variety of video types including educational, marketing, and entertainment videos. Key Project Details: - The primary goal of these videos is to entertain and engage the audience, so proficiency in creating engaging content is crucial. - Live-action is my preferred style. Ideal Freelancer Capabilities: - Expertise in live-action video production. - Demonstrated experience in creating a variety of video types, particularly educational, marketing, and entertainment. - Proficient with current industry standard tools and software. - Proven track record in creating entertaining content. - Creativity, flexibility, and the ability to work within a deadline. Looking forward to see your previous wo...

Hi! Your job 1. Go to a website (url in brief) every day to every other day 2. On that website click a link to open another website. This website is NOT live/active yet. 3. Open the list of names we have (about 30 names) 4. If one of the names from our list is listed on the website then send an email to us (not to the person) 5. Allow us to add names to the list, change where the email is sent, change body of email and when the scraping starts/stops as well as frequency (daily or every other day). You may NOT do manual entry You MUST build something that is automatic and can be edited by my team.

I'm looking for a developer to create an online multiplayer gaming platform that supports all gaming genres. Here are the key requirements: - **Live Streaming Capabilities**: The platform should allow for live streaming, enabling players to broadcast their gameplay to others. - **Player Matchmaking System**: A robust matchmaking system should be in place to ensure players are matched with others of similar skill levels, enhancing the overall gaming experience. The platform should support all gaming genres, including First-person shooter (FPS) and Role-playing game (RPG), and be accessible across different devices, including PC, consoles, and mobile phones. Ideal skills for this job include a strong background in game development, experience with multiplayer network...

You must be at least 16 years old and live in Eastern Europe or Latin America. ✻ NO EXPERIENCE REQUIRED ✻ You do not need any experience whatsoever, but you must be clever and eager to learn. No. I am *not* being charitable. I am being practical. ✻ PAYING YOU TO LEARN ✻ No. You aren't dreaming. I value intelligence and problem-solving ability over experience. I'd prefer to work with someone who is clever and learns quickly rather than someone experienced but is not very intelligent and/or does not solve problems scientifically. Would I hire an Isaac Newton or an Albert Einstein even if he had no programming experience? Of course I would. ✻ TESTS ✻ You must pass several difficult logic tests to work with me. The first logic test you complete for me will be an unpai...

I'm seeking help to set up OBS and overlays for live streaming my Pokemon card unboxing on YouTube. The primary goal is to give my content a professional look and feel. Key Requirements: - **OBS Configuration**: As a freelancer, you will be responsible for configuring OBS to ensure smooth streaming and high-quality video output. - **Overlay Design**: The overlays need to be Pokemon themed to resonate with my content. This involves both creation and integration into OBS. - **Professional Finish**: I am aiming for a polished and professional finish across the entire stream, so an eye for detail and understanding of what constitutes a professional look is key. The ideal freelancer for this job would have experience in OBS setup, overlay design, and a passion for or understanding...

Hi! Your job 1. Go to a website (url in brief) every day to every other day 2. On that website click a link to open another website. This website is NOT live/active yet. 3. Open the list of names we have (about 30 names) 4. If one of the names from our list is listed on the website then send an email to us (not to the person) 5. Allow us to add names to the list, change where the email is sent, change body of email and when the scraping starts/stops as well as frequency (daily or every other day).

I am searching for an experienced web developer to build an online platform for Hindu pujas. The main function of this platform is to allow users to book individual pujas in advance. Although live streaming functionality is not needed, the platform should be designed with user engagement and interactivity in mind. Key Requirements: • Development of an advance booking system • User-friendly interface • Secure payment integration Ideal Skills and Experience: • Proven experience in web development • Familiarity with advance booking systems • Previous work on religious or cultural platforms is a plus. Please elaborate on your relevant experience and suggest possible strategies for platform development. I look forward to partnering with you to bring t...

...developer to build an extensive real estate app compatible with iOS, Android, and Web-based platforms. Key Features: - Property Search: advanced filter mechanisms for property searches are essential. - Property Listing: A clear, easy-to-configure property listing feature is required. - Favorites/Save Listings: Users should be able to save favorite listings for future reference. - Live Call: An integrated feature for live-call discussions with property owners or agents. Additional Functionalities: - User Registration and Login: A secure user registration and login functionality is pivotal. - Location-Based Search: The app should have the capacity for location-based property searches. Ideal Candidate: You should have experience in developing real estate apps, and po...

...professional mockup for our business-oriented social networking platform, which will include a website and mobile application. Provide mockups for Mobile and Web site. The number of mockups can vary but this is not very complicated. The mockups should give idea of flow of application and navigation. Primary Features: - A platform offering business services, promoting social connectivity. - Live chat feature enabling users to interact instantly. - A sophisticated system for sharing photos and videos. - Capability to match business services with end-users. - Capability for the business to buy advertising space on the website and mobile application - A market place where customers can buy products from the different businesses Business Services: - Job listings service allow...

Hi Judith Mueller,I hope this message finds you well. Thank you for considering me for the opportunity to refine the project output through a live session.I propose a four-hour live session to collaborate on fine-tuning the project deliverables. During this session, we'll focus on [briefly mention the tasks or areas to be addressed, e.g., refining the banner and discussing design concepts for the website].My hourly rate is $10, making the total cost for the four-hour session $40. I'll be available to start the session at 1:30 PM CET today, as per your let me know if you agree to proceed with this proposal. Once accepted, I'll be ready to start the session at the agreed-upon forward to our regards,Rahul

I'm looking for a skilled videographer to film a one-hour DJ set in an outdoor location. Key Requirements: - Capture the entire set in a professional manner - Excellent understanding of outdoor lighting and sound challenges - Attention to detail in framing the shots and ensuring the set is the focal point Ideal Skills: - Prior experience filming DJ sets or live music performances - Proficient in outdoor videography - Excellent understanding of sound recording - Strong attention to detail and a creative eye The video will be used for promotional purposes, so it's important that it is shot professionally. I'm looking for someone who can bring creative and technical expertise to the project. If you have a portfolio of similar work, I'd love to see it.

I'm seeking a professional PHP expert to assist with my current project. Key Responsibilities: - Hands-on PHP web development - PHP script optimization - Integration of PHP frameworks - Debug and troubleshoot code I'm looking for an individual with a solid understanding of PHP, who can help take my project to the next level. Your ability to optimize scripts, integrate PHP frameworks, and tackle web development issues will be crucial. Please provide examples of your past projects, particularly those related to PHP development. Experience and knowledge of PHP frameworks are a bonus. If you're a skilled PHP developer and you're ready to tackle new challenges, I'd love to hear from you.

I'm in need of a talented graphic designer to create a modern brand logo for my business. My business is an appeal company focusing on this wonderful rock we live on spinning furiously through this void of space. The name of my business is Stupendous Void. Key Requirements: - Color Scheme: Predominantly black and neutral colors. - Font: Modern, sleek and professional. - Symbol/Icon: There should be a specific symbol or icon incorporated in the design. Ideal Skills: - Proficient in graphic design and logo creation. - Expertise in modern and minimalist design. - Able to convey a strong brand identity through simplicity and elegance. Looking forward to seeing your creative proposals.

I'm looking for a professional web developer to create a fully interactive online learning management system. The website will be used as an online home schooling platform to deliver GCSE and A Levels to students through live video and online lessons. The key features I need the website to have are: - Secure login area for Students, Teachers, and Parents - Live video lessons - Chat functionality - Interactive quizzes In addition to these, I also need: - Progress tracking feature - Discussion forums - Resource library Ideal skills for this project include web development, e-learning design, and experience in creating interactive online platforms. Please provide examples of similar projects you've worked on in your bid.

...in video-2, 20 times in video-3, then the cumulative number is 65 likes. (We can discuss this feature more and make it as easy as possible to develop) -Share button on videos (For engagement): Share button shares a pre-written text on X (Not the video- Just text) Pages: Token price chart: Link to Dexscreener- After the token is live Presale: Link to presale page (will be provided) - Tokenomics : Details about tokenomics. - Swap: Link to swap page (after token is live) Other general links like (Links to TG, discord, X, Cronoscan) You have the freedom to choose the platform for this project. Thus, proficiency in a range of platforms, such as WordPress, Shopify, or custom-builds is desired. Process: You will prepare figma design and submit and then work on the developmen...

I am seeking a skilled Laravel developer to build a live notification system with multichannel support – Email, Push, and SMS notifications. Key Functionalities: - The script should trigger notifications whenever a new message from the administrator is sent. - The appearance of these live notifications should be through a notification sound. Ideal Skills: - Laravel Development - Experience in developing notification systems. - Familiarity with Email, Push, and SMS notification integration. This requires a comprehensive understanding of Laravel and system notification integrations. Proven experience in a similar project will be a strong advantage.

I need a professional with a significant background in data management, who can assist me in streaming entire worksheets live from my desktop Excel file to my Google Sheets. The core requirement is to: - Stream the entirety of my existing Excel worksheet data into Google Sheets instantaneously and update it in real-time. The ideal freelancer should: - Be experienced in data integration across various platforms. - Possess comprehensive expertise in both Excel and Google Sheets. - Have a past track record of successfully completed data streaming related projects. - Be able to implement a solution for real-time data update.

...and engaging event flyer. The flyer must capture the spirit of Caribbean, featuring themes of vibrant colors, Caribbean flags and an under-the-tree promotional image showcasing our unique bar setup that is located under a tree in the backyard. I don't want images of the carnival masqueraders/costumes. Important event details that must be included are: - Event date and time - Location details - Live Band performance - Top local DJs - Extensive Caribbean breakfast menu, including johnny cakes, bread, and saltfish, and more A "break of day" background will set the mood for this dawn event. Experience in event or party flyers design is preferred, along with a keen understanding of Caribbean culture and aesthetics. Proficiency in graphic design software and creativ...

I'm in need of a professional PHP developer to manage back-end services and ensure interchangeability between server and users. Key responsibilities will include the development of all server-side logic, definition, and maintenance of the MYSQL database. This role also requires the optimization of the system for speed and scalability, as well as the integration of user-facing elements developed by front-end developers. The ideal candidate would have: - Solid PHP development experience. - Proficiency in MySQL databases and related operations. - Experience with User Management functionalities. - Expertise in Content Management operations. - Prior experience with Real-Time Data Processing. Your primary focus will be on: - Creating database schemas that represent ...

...for a skilled developer to create a live data feed plugin for Amibroker, specifically connecting to NSE (National Stock Exchange) in India. Key Requirements: - Real-time stock prices, historical data, and market indices are the primary data types I need the plugin to fetch. - The data should be updated every second, ensuring the most up-to-date information is available for analysis. Ideal Skills and Experience: - Strong experience in plugin development for Amibroker. - Proficient in connecting to NSE data feeds. - Solid understanding of real-time data processing. - Prior experience in developing data plugins for the financial markets will be a plus. The successful candidate will need to ensure the plugin is reliable, accurate,...

I am looking for a creative video producer who can b...my brand to life on screen. The video should target a professional audience aged 35-55 and must be delivered in a live-action format. Key requirements: - The video should clearly and effectively promote my brand and its unique selling points. - The target audience should resonate with the content; it should feel relevant and engaging for professionals in this age group. - The style of the video must be live-action. This is non-negotiable. Ideal skills and experience: - Proven experience in producing brand promotion videos, particularly for a professional audience. - Strong understanding of video marketing and the ability to create compelling narratives. - Proficiency in live-action filming and editing, with a po...

I need an experienced professional to move my existing website from its current subdomain to the live server on WHM. With missing specific information at this moment, it would be best if you are knowledgeable in various platforms such as WordPress, Joomla, or Drupal for versatility. Your responsibility includes: - Safely migrating the site without affecting the existing content - Assuring the website functionalities are working seamlessly after migration - Resolving any potential glitches after migration Essential skills: - Extensive experience in website migration - Familiarity with WHM - Proficient in WordPress, Joomla, and Drupal - Proactive in solving unexpected problems during and after migration - Strong communication skills Make sure to put forward any questions befor...

I need a skilled web developer who is proficient in HTML/CSS, JavaScript, and PHP to help transfer my custom coded website from the test server to the live server using terminal. Having deep knowledge in server migration, DNS and terminal operations is crucial for this task. The key tasks will include: - Safely transfer all site files and databases. - Ensure site layout and functionalities are consistent with the version on the test server. Please only bid if you are confident in your skills to prevent any downtime or data loss during the migration. Experience in similar jobs will be a major advantage.

I need new features integrated into the existing PHP code. It's vital to note that your proficiency in PHP will be instrumental. I expect the freelancer to provide suggestions and potential improvements in creating a robust application.

I need an expert who can skillfully combine the design elements, content, and functionalities from my two existing websites to create a unified site. Specifically: - The job will require expertise in blending layout structures, and graphical elements from both sites. - Additionally, content from each site needs to be merged in a comprehensible and engaging manner. - The functionalities of both sites must be inherent in the final product without any glitches. Ideal skills: - Proven web development skills - Website design expertise - Proficiency in handling graphics - Content management Websites: Lizard Energy works with Renewables (Solar Panel, Battery storage etc..) and Electricnezz with main electrical jobs. Lizard content needs to be added into Electricnezz content as Electri...

I want a script that allows me to export a Zencart catalog () to CSV in real-time with the following fields: Title Short description Category (x, y, z) Description Image URLs (URL1, URL2, URL3) Price Stock

We are seeking freelancer expert to write a new enhancement in our exosting an On-Prem AI Video analytics (VA) software. Existing products works on live feed, find EHS violations after running models on frames and insert into DB. It has an existing dashboard as well. New features will primarily focus on analyzing traffic violations. The new enhancement should be able to handle ANPR and Speed Violation detection based on a live video feed from inside plant roads. Key Features: The software should provide - check valid vehicle # with registered list for unauthorized entry. - Speed violation to handle 5 to 40 Kmph threshold - Violation Snapshot/Video will be stored on on-prem server. - Each violation with trigger Auto Email and/or SMS ...

...few to earn the new IFC badge on your profile so that you can stand out! (Upon successful completion of the test) - Priceless! ➡️ Unlock hours of groundbreaking video content I’ve been working on for months that's nowhere else to be found. (399 USD, INCLUDED!) ➡️ Numerous attachments with client conversation pipelines, strategies, tools and much more! (199 USD, INCLUDED!) ➡️ Dive into biweekly live streams with the masters, ask anything you want, and pick up secrets they don't just share with anyone. (100 USD per hour, INCLUDED!) ➡️ An overview with my thoughts of all newsletters I'm subscribed to in freelancing/AI/Digital, giving you the edge you need. (99 a month, INCLUDED!) ➡️ ️Personal guidance & mentoring from best freelancers (From 80-120 USD p...

i have this one : Thats What i want : 1- Custom Referer(Header) for m3u8 links ; Thats All. This app OXOO written with JAVA. Text me IF you can dothis job.

I need a skilled web developer who is proficient in HTML/CSS, JavaScript, and PHP to help transfer my custom coded website from the test server to the live server using terminal. Having deep knowledge in server migration, DNS and terminal operations is crucial for this task. The key tasks will include: - Safely transfer all site files and databases. - Ensure site layout and functionalities are consistent with the version on the test server. Please only bid if you are confident in your skills to prevent any downtime or data loss during the migration. Experience in similar jobs will be a major advantage.

...search and filtering capabilities. - Shopping cart and checkout functionality. - User review and rating system. - Integration with local payment gateways. - Affiliate marketing panel. (can be modified from main panel) - A dedicated Android delivery application. -Social media integration. -Chat with customer support. -Messages between customers (future). -Location, (description, and current location live map location selection), for address will be delivered to. -FAQ. -Gallery. -Chat. -Map. -Form. -Membership. (future) -Video. -QR code for each profile. -delivery system + QR code check camera with customers when delivered. -Tips for delivery. -control panel (including map to follow delivery, and QR checks - @ spicily for each name cannot be repeated -Inside wallet and can be tr...

I am searching for an experienced web developer to build an online platform for Hindu pujas. The main function of this platform is to allow users to book individual pujas in advance. Although live streaming functionality is not needed, the platform should be designed with user engagement and interactivity in mind. Key Requirements: • Development of an advance booking system • User-friendly interface • Secure payment integration Ideal Skills and Experience: • Proven experience in web development • Familiarity with advance booking systems • Previous work on religious or cultural platforms is a plus. Please elaborate on your relevant experience and suggest possible strategies for platform development. I look forward to partnering with you to bring t...

II'm in need of a skilled developer to build a PHP, HTML, and CSS based public grievance web-based project for me. This project will include: - Complaint Handling System: This system should be capable of receiving, processing, and resolving complaints from users. It should categorize complaints based on their types and departments. - Sentiments Analysis Graph: An integral part of this project is the sentiments analysis graph. The graph should be designed as a bar chart, displaying the overall sentiment of the received complaints. - Department Categorization: Complaints should be automatically routed to the relevant department based on their nature. Ideal candidates for this project should have: - Proficiency in PHP, HTML, and CSS - Experience in building web-based comp...

Looking for a freelancer to assist in creating new service pages for our property maintenance service website. You should be able to create fresh/origina...are not an individual and/or represent someone else (agency, company etc.), please do not submit the proposal it will not will not be considered.) Q2: Are you equipped with a webcam and feel comfortable communicating via video calls during UK working hours (8AM - 6PM BST)? Q3: Do you consider yourself a talented and skilled web designer? If so, please share 3 x URLs (no more than 3) of your best live webpage designs that you have created. Q4: Are you open to completing a test task to prove your above skills? Q5: Do you have a strong understanding of SEO principles, including Meta Titles, Meta Descriptions, H1; H2 Tags, etc. ...

Hi, I'm looking somone to edit my websoftware developped in php/mysql : Add : - field to attach a file per client - add account expiration date - Email notification - Link vehicles by API with our geolocation system

I need a proficient PHP coder who can write a script for me that will print images (in JPEG format) and QR codes on a thermal printer. The images are our company logo and the QR codes are meant for conducting reviews. This PHP script will be used online on a cloud platform. Ideal skills for this job are: • Strong expertise in PHP • Familiarity with JPEG images and QR codes • Experience in creating scripts for printing needs, specifically on thermal printers • Understanding of cloud platform workings. Your primary task will be the creation of a script that can accurately print images and QR codes on our thermal printer, effectively facilitating bill printing for our operations. Deliver a clean, efficient code that can be effortlessly integrated a...

client will received a console in which he will live his app on playstore

...button to enbale/disable tracking. 3. Fetch GPS coordinates 3.1 Store last 50 coordinates in memory. 3.2 Have customizable recording frequency (i.e. Rate at which module should capture GPS coordinates) 4. Push GPS coorinates to (firestore DB (Important)) 4.1 Two Push modes 4.1.1 : LIVE: Send the coordinates as and when they are recieved. 4.1.2 : DELAYED: Store coordinates in a temperory queue and Send them every 5 Sec. 5. Along with GPS also send Speed information. // Push coordinates API contract Data Structure :- <TrackerId> : { coords: [ { loc: [<lat>,<long>], Speed: 14 }, ... ] } Result : 1. Steps to deploy code to A9G module 2. How to change GPS coordinates recording frequency Idea...

...automate the transfer of payment information from Stripe & bookings/Transactions from our Education Management System to eventually present live information of the correct balance for the students and tutors. And to check if we can create a login page to access students’ payments, invoicing, and balances. 3. Testing and Troubleshooting Thorough testing to ensure that the integration and all data is working well with 100% accuracy. This includes handling different types of payment statuses and ensuring data accuracy. 4. Deployment and Go-Live Deploying integration in the live environment and monitoring the initial transactions to ensure stability and correct data handling. 5. Documentation and Training Documenting the new processes ...

...a developer to create a unique, custom-built website geared for a cryptocurrency presale. This site will be the primary source for information about the token and presale, so it needs to be user-friendly and intuitive. Key areas of focus will be: * Custom-built platform: I'm not interested in using WordPress or Shopify. My preference is a website custom-built from scratch. * No live chat feature: I don't need a live chat function implemented within the site. * Branding and color scheme: I have my branding guidelines and color scheme that will need to be adhered to during the website build. Ideal experience for the freelancer would be past work with cryptocurrency websites, professional understanding of the crypto landscape, and experience in building custom web...

I'm seeking a Indian professio...trends and effective teaching strategies. - Be able to engage with the audience effectively, and create a webinar that encourages interaction and participation. Key deliverables include: - A 30-60 minute webinar that effectively covers the topics of Education technology trends, Effective teaching strategies, and Engaging students in online learning. - Incorporation of interactive elements such as Live Q&A sessions, Polls and surveys, and Interactive quizzes to make the webinar engaging and informative. - Provide insight and recommendations on how to enhance the webinar to maximize audience participation and engagement. If you have the necessary skills and experience to create an engaging, informative and interactive webinar, I would lov...

I'm currently experiencing some technical problems with my PHP website. Though it functions smoothly on localhost via XAMPP, errors arise upon moving it to our server on HostGator. The desired candidate for this job has the following abilities: - Extensive knowledge in PHP and server-handling, preferably with HostGator - Experience with troubleshooting and resolving website issues - Capable of fixing server-related issues Typical problems we're facing include: - Site not functioning correctly on the server despite proper local host operation - Error messages - Performance issues This troubleshooting requires someone who can detect and fix issues from server-end to user interface. Prior experience with cases similar to ours will be a plus. Applicants should also...

...video I am seeking is a live-action video. The desired individual should have substantial experience creating this type of content. - Most importantly, this promo video must clearly convey our company's mission which is "Creating Chemistry between India & the World". Ensuring a clear, comprehensive and compelling portrayal of our mission is the major focus of this job. We are a chemical company and have the tagline Creating Chemistry between India and the World. The idea is to sell Indian chemicals to the whole world. You can refer to our website To be successful in this task, the ideal candidate needs to be a creative narrative storyteller, with proficiency in editing software such as Adobe Premiere Pro or Final Cut Pro. Previous experience in producing ...

I'm in need of a developer with specific experience in creating a serial port driver (RS232) for a Windows operating sys...in creating a serial port driver (RS232) for a Windows operating system. The key requirements include: - The driver needs to be developed using the C programming language. Profound knowledge of C, Windows APIs and asynchronous serial communication (RS232) is essential. - As part of the project, a communication dashboard needs to be created too. The dashboard must have the capacity to track live data, support multiple connections and should incorporate a customizable interface. Therefore, seeking candidates with strong skills in GUI development, database management and networking too. Looking forward to discussing this project with interested a...

I'm seeking a skilled web developer to create a dynamic sports betting website. Key skills and experience ideally include: - Expertise in creating secure, user-friendly login and registration functions. - Ability to integrate live updates of odds and results. - Proficiency in setting up payment systems for user deposits and withdrawals. The website will solely focus on sports betting, particularly for football and basketball. Coding to accommodate these sports specifically is desired. Experience in the betting industry web development is an asset. The website should provide exceptional user experience, with simple navigation and engaging design. Eventual upkeep and version upgrading could be part of our ongoing relationship.

Need website speed fixed on both Desktop and Mobile. SCORES MUST BE BASED ONLY ON GOOGLE LIGHTHOUSE SCORES ONLY Scores are currently ~55 Mobile and ~ 67 on PC. Need Mobile: 90+ Score Need PC: 80+ Score Load times are terrible and must be under two seconds globally on any page. Must not effect the website functionality or looks. ...website speed fixed on both Desktop and Mobile. SCORES MUST BE BASED ONLY ON GOOGLE LIGHTHOUSE SCORES ONLY Scores are currently ~55 Mobile and ~ 67 on PC. Need Mobile: 90+ Score Need PC: 80+ Score Load times are terrible and must be under two seconds globally on any page. Must not effect the website functionality or looks. Testing must be done on your own staging site as to not disrupt the live website. Message me for link to website. B...

Looking for a very expereinced php devleoepr for multiple bug fixes

We need AI engineer to do video analytics platform Running camera on SBC / rasperberry pi (ubuntu), recognize object, human and car plates than submit data and livestream to platform 1. Platform (server) Receive live stream video from cameras from Singleboard Computer 2. SBC Send video stream to platform Recognize object, human and car plates and save to json output Send Json output to Platform

I need assistance troubleshooting an Ajax call. Specifically, there's an issue with the condition logic--validating user authentication status. I am seeking a skilled professional who has: it only front end work - Expertise in integrating API - Extensive experience in Ajax - Understanding of condition logics - Knowledge in remote desktop support This task requires 1 to 2 hours of remote work. Please ensure you're available for this duration. Your assistance will be highly appreciated!

I acquired a PHP script from Codecanyon and seek a skilled developer to enhance its capabilities. The primary tasks involve implementing robust data validation mechanisms and integrating a specific condition for the calculator functionality. Project Requirements: Data Validation: Strengthen the script's data validation process to ensure accuracy and security in handling user inputs. Calculator Functionality Enhancement: Customize the existing calculator feature to include a specific condition, optimizing its performance and usability.