Virtual airline create route map jobs

Car Driver (Turn by Turn Map Verification Project)

Your expertise will contribute to a cutting-edge project that combines music generation with voice cloning to create songs sung by virtual personas. We want our app to have the following features. - Create unique music based on user input information (speed, type, length...). - Create music based on the voice provided by the user - Change the voice of music provided by the user to the voice provided by the user Skills expected of you 1. Strong background in machine learning, deep learning, and neural networks. 2. Experience with audio signal processing and familiarity with audio data preprocessing techniques. 3. Proficiency in Python and experience with machine learning libraries such as TensorFlow, PyTorch, and Keras. 4. Knowledge of music theory and composit...

I'm seeking an expert in Azure cloud cost savings particularly with regards to the purchase of reserved instances for Virtual Machines. Through Azure Advisor Savings, I have identified an opportunity to potentially reduce total costs. As such, I'm seeking an expert's review and recommendation concerning this initiative. Key Responsibilities: • Review current Azure Advisor Savings recommendation • Provide a comprehensive report justifying the necessity or otherwise of the reserved instances purchase • Recommend optimal configurations (if necessary) to maximize cost savings Ideal Skills and Experience: • Proven experience in FinOps, particularly on Azure Cloud • Expert knowledge on Azure VM Reserved Instances • Strong understanding of...

I'm looking for a skilled WordPress & App developer to create a dynamic web application and corresponding iOS/Android apps. The project is aimed at developing an Events and Staff Management application. The main features of the application will include: - Event Scheduling: The application should allow for the smooth scheduling of events. - Staff Scheduling: The application should facilitate in allocating staff to the scheduled events. - Attendance Tracking: The app should track the attendance of staff and participants at events. - Embed Video Call Platform: I'd like the application to have the ability to embed a video call platform for virtual events, such as Zoom. - Access Pass Creation: The app should be capable of creating unique 'Access Passes' fo...

I am looking for a virtual assistant to support the Managing Director of Hedsor House, an event venue located in Buckinghamshire, England. This role will involve assisting with various administrative and project management tasks aimed at expanding the business. The successful candidate will have strong organisational abilities and experience coordinating complex projects from concept to completion. Primary responsibilities will include scheduling meetings and appointments, coordinating vendor relationships, compiling reports and presentations, and providing general backend support. The role requires the ability to juggle multiple concurrent tasks and thrive in a fast-paced environment. Effective communication and interpersonal skills are a must to interface with both internal an...

I have built an Android app in Android Studio (Iguana) but I cannot figure out how to upload it to the Google Play store. Hence, I am seeking a qualified freelancer to provide a 1-hour virtual tutorial explaining the app submission process. I want to be on VTC and share my screen while someone guides me through the process. This tutorial should primarily focus on: - The process of submitting an app to the store. - Understanding the app store's guidelines. - Tips on app signing and security. Upon successful completion of the class, an opportunity to build additional apps may arise. Remember, the ideal freelancer should have verifiable experience in Android app development, app store submissions and previous training/tutoring experience may be an advantage. One additional note...

Our AI Virtual Assistant helps recruiters with candidate sourcing. We are looking for people to help with monitoring that it works properly. Key Responsibilities: - Almost no involvement, just checking it quickly for 5-15 minutes every week. It is designed to work fully autonomously and may take no time at your end. The ideal candidate should have: - No previous experience is required - Monthly ongoing compensation. Please apply if interested, there is additional important information that will be discussed with interested candidates.

I'm searching for a skilled Virtual Assistant (VA) to manage a small inventory of less than 100 entries. Your responsibilities will include: - Data entry: Accurately inputting necessary information into our system. - Spreadsheet management: Expertly organizing and managing our inventory data in Excel. - Reporting: Creating clear, concise, and actionable reports based on the inventory data. To execute these tasks proficiently, you should be well-versed in the SUMIF and Pivot Tables functions in Excel. Prior experience in managing small to medium-sized inventories will prove beneficial. Your ability to pay attention to detail, demonstrate excellent problem-solving skills, and deliver results in a timely manner will be important for success in this role.

Simple editing task to enhanced an existing image

I'm looking for a professional mobile app developer who can create a robust e-commerce application similar to Fashion Nova. The app is intended to be developed for both iOS and Android platforms, with an additional web app component. Key Features: - User Registration and Login - Product Browsing and Search - Shopping Cart and Checkout - Vendor Page - Order Tracking - Admin Panel - Dynamic Backend Analytics - Personalization - In-App Chat for Customer Service I am not looking for specific design or branding requirements at this stage. I'm particularly interested in your experience with e-commerce app development, as well as any unique features or functionalities you can suggest to enhance the user experience. Please provide any relevant examples from your portfolio.

Project details €25.00 - 300.00 EUR. I am looking for an experienced developer to create a bot (on the telegram platform) capable of instantly buying and selling Solana tokens on Raydium, Jupiter DEX. You will need to develop a bot that will perform transactions fully automatically, without the need for manual approval. Key features: Telegram platform Seamless integration with Raydium. Orca. Jupiter. Phantom wallet import Instant execution of buy/sell orders (swap in less than 1 second) Copytrading Full automation of operations. The ideal candidate should have: Experience in programming trading bots. Excellent knowledge of Solana and its DEX platforms (Serum Dex). High level of accuracy and attention to real-time changes. More details will be provided upon receipt of the as...

As someone juggling multiple responsibilities, I'm in need of a reliable and flexible virtual assistant. Responsibilities: - Manage my schedule by coordinating appointments - Tackle basic administrative tasks as they surface - Likely will start with small tasks Requirements: - Fluent in English language - Available for less than 10 hours weekly - Excellent organizational and multitasking skills - Friendly and easy to get a long. - Communicates regularly - Able to offer ideas - Good with basic digital technology--Google, MS, Canva (would be great), Trello, etc. Previous experience in a similar role would be a plus. The ideal candidate should be able to prioritize tasks and work independently. I'm looking forward to finding a partner to help lighten the workload and ...

Seeking a compelling new mobile app icon for a public transit app. The design should integrate our primary colors which are blue and white. Old app icon provided for reference. The new design, which cannot simply be the letter M, might possibly incorporate the rail line colors on the system map file provided. Simple is better. Final deliverable should be in Adobe Illustrator Artwork file (AI) format. • Designer should have a solid grasp of iconography, color theory and commercial design principles. • Understanding of local symbols or cues associated with public transit would be useful. • Needs to be visually appealing and instantly recognizable as a transit tool. Prepare to share similar past projects in your portfolio when applying.

Create ui for rice disease detection model in flask

I have a complete PDF map and require an architect to upload it to the LDA portal. Key tasks: - Upload the existing PDF map to the LDA portal without any modifications or updates. Ideal skills and experience: - Prior experience uploading maps or similar documents to the LDA portal. - Understanding of the architectural or land development industry. - Familiarity with PDF file formats and the specific requirements of the LDA portal. Please ensure you have the expertise and access to fulfill the requirements of this project before submitting your proposal. Thank you.

I'm looking to add a virtual try-on feature to my website, specifically for clothing items. The system should be built around 3D models to ensure a realistic and engaging experience. Key Features: - The virtual try-on feature should support multiple sizes for each clothing item. This is essential for providing an accurate representation of how the clothes would fit across different body types. - The technology used for this feature should be based on 3D models, as it allows for a more immersive and interactive experience for users. Ideal Skills and Experience: - Proficiency in 3D modeling and web development - Experience in implementing virtual try-on features for e-commerce websites, ideally in the clothing industry - Understanding of user experience (UX) desig...

I'm in need of a skilled professional to configure my Fusion PBX system to implement direct call routing. Key Requirements: - The system is currently cloud-hosted. Prior experience with cloud-hosted PBXs is a plus. - I have between 1-10 phone numbers that need to be set up for direct routing. So the Requirement is : You have to configure Inbound Calls using a Soft Switch and Route them to Outbound to an External Location. I am not familar with Fusion PBX UI, which is causing the Problem only. The ideal candidate for this project will have: - Relevant experience in configuring Fusion PBX systems. - Strong understanding of direct routing in PBX systems. - Prior experience with cloud-hosted PBX systems.

We need experienced IOS APP developer to create a program that will assist in our medical project. The project Each student will receive a piece of paper with small colored litmus squares on top. Student will drip chemicals onto each square and observe the color change on the litmus squares. The 'NEW' color of each litmus square must match against a "Legend/Color Chart provided". Student will take a picture of the colored squares with their phone camera and upload it onto the APP/program. The APP/program will need to find the closest color match from the Legend, and display the final result. Requirement The app does not have to look pretty. Something basic will do. The APP must be able to accurately identify the ‘New’ color against the Legend...

I am seeking a diligent and social media-savvy Virtual Assistant to focus on Facebook outreach that would involve daily engagement with comments and messages. This initiative is geared towards promoting a specific marketing service. Salary: 5$ hourly rate + appointment scheduled commission 15$ Key Responsibilities: - Engaging actively with user comments and messages to promote our product/service. - Creating a professional and approachable online presence for our brand. - Sending around 20-30 cold messages per hour - Managing 1 google sheet document with leads Ideal Skills and Experience: - Proven experience as a virtual assistant or similar role - In-depth understanding of Facebook's engagement tools - Decent communication and writing skills (English) - Ability to pr...

We are looking for a highly organized and proactive Virtual Assistant to support our upper management team. As a Virtual Assistant, you will be responsible for providing administrative support, managing schedules, handling communication, and assisting with various tasks to help our executives operate more efficiently. Responsibilities: * Manage and maintain executives' schedules and appointments * Coordinate meetings, conferences, and travel arrangements * Screen and direct emails * Prepare reports, presentations, and documents * Conduct research and compile data as needed * Assist with project management tasks * Handle confidential information with discretion * Provide general administrative support to the upper management team Requirements: * Must be a strong English...

I am in need of a content creator who will create five copyright-free YouTube videos for my channel. The videos will be focused on observable tales and dodgy stories, a topic that young adults, my target audience, can appreciate. - Video Content: The videos will revolve around a variety of "dodgy tales". Succinct storytelling skills are paramount. The ability to craft engaging, compelling narratives will be highly appreciated. - Video Length: Each video must be around 4 - 5 minutes. Please note that creating content that fits within this time limit but still successfully delivers the intended story is crucial. - Target Audience: The videos will be tailor-made for young adults. Knowledge and understanding of this demographic’s preferences will be beneficial. - Skills...

*** Please Read Before Messaging *** At this time I am just looking for quotes, if you are serious about this project please send me a direct message with a FULL quote. I will be making a more clear guideline to the app layout later on but for now here is the summary of what I am looking for: I want to build a completely virtual, 3D claw machine game. I will need a specific prize algorithm coded into the game so that the prizes don't spit out at random and we are able to control profit flow. The game will come with 10 free tokens for daily play, but will push sales of additional tokens to win prizes. The boxes in the claw machine will just be color coded boxes that align with the colors on the prize page. This game will need an admin panel, a user page, payment systems...

I need an AI expert to develop and integrate a simulator into my Shopify store, that focuses on wallpaper and fabric application. Key Features: - The simulator should use both virtual room visualization or uploaded by customer and fabric draping simulation for a realistic user experience. Ideal Skills: - Proficiency in AI algorithms and Shopify integration - Experience with fabric and wallpaper visualization or related field - Strong understanding of UI/UX design for a seamless customer journey - Proven track record with similar projects. Thanks

I'm looking for a skilled professional who can create a 1-minute live video on our website. This live video will be streamed using the front camera and will serve as a product demonstration. The ideal candidate for this project should have experience in: - Video production and live streaming - Web development (to integrate the video on our site) - Understanding of live video interaction features Key requirements: - Create a 1-minute long live video - Use the front camera - Support real-time comments - The video should be engaging and visually appealing - Ability to optimize the video for web streaming - Ensure the video is compatible and functional across different web browsers - Deliver a product demonstration that is clear and concise - Implement interactive elements...

I'm in need of a skilled professional who can create a live video for me. This video will specifically cater to my corporate conference and will be used on Reels and YouTube shorts. The main focus of this video will be on the audience interactions rather than the typical keynote speeches or panel discussions. Key requirements: - Creation of a live video for a corporate conference - Emphasis on capturing and showcasing audience interactions - Targeting Reels and YouTube shorts for the final video Ideal skills and experience for the job: - Proven experience in creating engaging live videos - Understanding of the dynamics of corporate conferences - Ability to highlight audience interactions in a compelling way - Familiarity with the format and requirements of Reels and YouTub...

We will give you: 1. Virtual Numbers 2. SIP Trunk server I am in need of an expert who can develop a SIP Trunk server with the capability of enabling live voice stream access. Key Requirements: - SIP Trunk Server: The primary purpose of this project is the development of a SIP Trunk server. It is essential that the chosen freelancer has experience in developing such systems. - Live Voice Stream Access: The server must offer functionality to enable live voice stream access. This feature must be robust, reliable, and seamlessly integrated into the server. - Access Control: I need the live voice streams to be secured with user-based permissions. This ensures that only authorized users can access the streams. Integration: - The primary platform that the SIP Trunk server will integrat...

I need someone to patch up a map of 2 cities (to make 2 prints; one for each city) with clear street names. Google map works but some touchup might be needed.

PLEASE READ THE ATTACHED DOCUMENTS BEFORE SENDING A MESSAGE ASKING FOR THE PROJECT DETAILS OR TO AWARD YOU THE PROJECT WITHOUT PROVIDING THE REQUIREMENTS MENTIOEND IN THE DOCUMENTS, IF YOU DID NOT READ, I AM SORRY, I WILL BLOCK YOU I’m seeking to team up with an expert developer to build a SaaS platform for virtual assistant services. This platform should include: - Task management capabilities to efficiently manage and delegate tasks, - Calendar integration to keep track of all events and deadlines, - Time tracking tool to monitor hours spent on tasks. Additionally, I require full UI customization, significantly beyond mere logo and colors. This should include HTML and CSS customization capacities to adjust the themes, layouts and all other elements as necessary. Payment m...

I'm seeking a professional to assist with a project focused on microplastic concentration. The main objectives are: - Estimation of microplastic concentration - Conducting geostatistical analysis - Simulating microplastic distribution The specific geostatistical technique we are interested in is Kriging. - create a map for the distribution of microplastic by: (a) Ordinary Kriging , Universal Kriging, Indicatorkriging, Bayesian Kriging, Geostatistical Simulation for the categories: coast, river, soil. Use a GIS-software (ArcGIS or QGIS) Due to the nature of the data, the ideal candidate should have experience in geostatistical analysis, environmental studies, and plastic pollution simulation. Proficiency in Kriging is a must, and the ability to work with field, lab, or...

I have a xenserver with four windows virtual machines. it is installed in a DELL server with RAID. A electricity failure damage the boot and got the grub rescue console. I load ubuntu from a usb and can see the lvm partition, but can copy. So I need some one to help me to copy the virtual disk to other xenserver instalation to load the fout virtual machines.

I need a professional and highly skilled 3D artist with a proven background in creating high-detai...valleys, forests, lakes, oceanfronts, along with a fantasy-themed island. - Level of Detail: The artist must be adept at delivering high level of detail in their work, with sharp, intricate textures and rich foliage to create a ultra-realistic rendition of natural landscapes. - Ideal Skills: Expertise in popular 3D modelling and rendering software, deep understanding of texture creation, color balancing, lighting and environmental effects. Previous experience in gaming or animation industry would be preferred. Your prowess in conceptualizing and creating immersive, lifelike virtual spaces will be crucial for this project. I can't wait to see your unique interpretation ...

I am in need of an expert in website transfers who has extensive experience with Magento. I currently have my site hosted on a Virtual Private Server (VPS) and it operates on Magento 2. The task includes the following: - Comprehensive understanding of what exactly needs to be backed up in a Magento website. - Creating backup files that encompass all necessary aspects of my website. - Completing a full site transfer using the created backup files to preserve integrity and functionality. You must have: - Expertise in website migration, particularly Magento sites. - Proficient knowledge in creating and using backup files. - Familiarity with hosting environments, specifically VPS. - Strong understanding of Magento 2. I am open to guidance on best practices for site transfers and b...

I have a Flutter project built using version 2.0 and integrated with Google Maps plugin. The Google Maps is functioning perfectly on Android, but on iOS, the map fails to load. I need an experienced Flutter developer who can help me identify the underlying issue and fix it so that the Google Maps works seamlessly on iOS devices. Key points: - Fix an issue where the Google Maps plugin is failing to load on iOS devices - Ensure the map interactions are smooth and not laggy - Maintain the correct map rendering on both Android and iOS - Previous experience with Flutter and Google Maps plugin is a plus

...- Need Playstore Or App Store Link (Based on user app platform) with referral code on sharing the referral code - Need two line category icons and need to suffel the icon on module index page - Display Offers Tag on the Category icon - Login page customisation with Otp flow for login - PopUp on index page – landing page - Need Popup screen with item link / store link / campagin link - Need live map moving for Delivery man location tracking on User App - Change Splash Screen - Payment Gateway Already integrated and need some changes (In Present version – User need to enter the UPI ID & then Go to their UPI App Manually for making the Payment. I need like “While clicking the UPI App Logo – The UPI App needs to open with the payment flow automatically&rdq...

Chat Team This job is for live chat support on Twitter/X. We are seeking individuals with a pleasant personality, strong work ethic, and a desire for stable, long-term employment. Tasks: - Engage in conversations on Twitter/X (500 - 700 tickets per day). Work Hours: - This is a full-time position requiring 6 - 8 hour days. - Our primary team operates in the Eastern Standard Time (EST) zone. - You are free to work from any location at any time. - Mandatory handoff meetings occur throughout the week to address questions and provide updates. Criteria: - Excellent English skills in reading, writing, and speaking. - Strong organizational skills. - Fast internet connection. - Team player with a sense of humor. - Enjoys engaging in conversations. Tools: - Twitter/X Hiring Process: We welco...

Makeup color tone recognition, facial recognition, skin tone matching, virtual try-ons, AR Effects and Filters, Custom color Makeup selection, Subscription Services and Premium Features, Create Makeup Filter Catalog.

I am seeking a talented web designer to help build an engaging website that really catches the eye. This site will be for my medical tourism consultancy - taking the form of a virtual clinic, it will need to reflect the highest standards of professionalism. Key Features: - Structured, well-organized layout - Simple, intuitive navigation system - Clean design elements that reflect a modern medical aesthetic - Intuitive booking or contact system for potential clients Ideal Skills: - Proven experience designing clean, professional digital environments - Familiarity with the medical field can help for a smooth project run - Strong UI/UX design skills - Coding skills such as HTML/CSS or JavaScript are a plus - Ability to incorporate a simple booking/contact system Your portfolio showi...

We are looking for a remote support specialist to help with daily job postings on LinkedIn. Requirements: - Making one job post per day - The job post should include all the necessary information such as job title, description, requirements, and qualifications which we will provide this for you. Ideal candidate: - Excellent written communication skills - Proficient in using LinkedIn for job postings - Ability to follow instructions carefully This role is simple and only takes few mins per day, we welcome everyone to apply especially those who are starting out as freelancers on this platform.

I'm a CEO, and independent journalist and filmmaker and am in need of a virtual assistant to help with various tasks including email management, calendar management, and online research. People who have worked in the media industry would be highly suitable. Key Responsibilities: - Email Management: The ideal candidate will be responsible for filtering and organizing incoming emails, responding to inquiries, and scheduling meetings on my behalf. Previous experience with managing professional email accounts is a plus. - Calendar Management: The VA should be proficient in managing calendars, scheduling appointments, and setting reminders. - Online Research: You will be required to conduct online research on various topics and present the findings in a clear and concise manner. S...

We are looking for flutter app developer. Who develop app fot us Project - traveler find a local for travel together Requirements - user creation with authentication Search locals by filters Arrange trips Manage payments with QR code Rozorpay Virtual wallet Chat messenger Admin panel Reference app - showaround ( paystore)

...view products under a shop. Here's an example of a shop on our website: We want to create a new design for the shop and a product view, both designs should be responsive. You can start by creating the shop view first, and if your design is selected, you can finish up with the product view. We don't want this to look like your regular eCommerce website, so creativity and the unusual are welcome. I should mention that we only have the following data for each shop. This data should be used to populate the design as you see fit: - Shop Name - Description of the shop (products they sell, slogan, etc) - Shop Address - GPS Coordinates (we can display a google map) - Logo - Color Theme - WhatsApp Number - Distance (How near/far the shop is from user's location)...

I'm in need of a reliable and experienced freelancer who can provide ongoing virtual assistance for tasks that include managing Airbnb, booking personal appointments, travel arrangements, and finding a handyman when needed. Key responsibilities include: - Coordinating Airbnb operations: managing bookings, coordinating with guests, and handling any issues that may arise. - Arranging personal appointments using online platforms or over the phone. - Coordinating travel itineraries: booking flights, accommodations, and transportation. - Finding suitable handyman services as needed. For a successful application, please include details of your previous experience in similar roles. Ideal candidates must demonstrate the ability to work remotely and must be well-organized...

I'm looking for a virtual administrative assistant to help with some data entry tasks on a part-time basis. The project is ideal for those who are looking to do a bit of work to earn some extra cash. - **Responsibilities**: Your primary responsibility will be to enter data. It's not a complex job, so you don't need special skills other than basic computer literacy. - **Communication**: For updates and progress, I prefer that you communicate through a specified online process. This will be discussed further with the chosen candidate. Ideal candidate: - Basic computer literacy - Good attention to detail - Reliable and able to work independently - Communication skills to provide updates promptly. - Spanish is a plus. This is a job that can be done remotely, so you ...

I need a mobile app for both iOS and Android that's focused on travel. The primary goal is to offer a user-friendly experience for travelers. The app should have: Dynamic Interactive Map: Showcasing points of interest. Chat System: For user interactions and inquiries. Account Creation System: To manage user profiles and settings. Tour Guide Booking System: To connect users with local guides. Ideal candidates should have experience in developing both iOS and Android applications, as well as in building intuitive and user-friendly interfaces. Knowledge of maps and location-based services would be a strong advantage. Please provide samples of your previous work in your proposal.

I am looking for a skilled developer to create a custom-built WordPress / Woo Commerce website or other platform for my new business selling women's sportswear, using quality plugins. I would like to discuss functional plug-ins and structure that will be used prior to the award. This site should be user-friendly, intuitive, and enthuse high-level interactivity, crisp and detailed design with design details. Ability to host high quality crisp photos & videos. Site should be extremely fast! Key Features: - Focus exclusively on gym sportswear and related products - Implemented chatbots and interactive menus to provide instant assistance and engaging user interaction - A precise, yet interactive, section dedicated completely to customer reviews and ratings on our products Ide...

I'm in need of a professional photographer who can carry out a virtual photo and video shoot for a couple. The shoot is centered around boudoir, erotica, and sensual themes. Key Tasks: - Conducting a virtual photo and video session for a couple. - Ensuring a comfortable and private setting for the shoot. - Capturing high-quality, intimate shots that align with the boudoir and sensual aesthetic. Requirements: - Previous experience with virtual photography and videography. - Proficiency in capturing boudoir, erotica, and sensual content. - Ability to direct and guide individuals remotely during a shoot. - Respecting and maintaining complete privacy throughout the shoot. Ideal Freelancer: - Professional photographer with a strong portfolio in boudoir and sensual...

I'm looking for an Adobe Air expert with experience in SWF to modify my game spinner. Key Requirements: - Make the spinner work with a wireless buzzer keystroke - The spinner should determine game actions The game spinner is currently designed to spin a virtual wheel and I want the expert to integrate this functionality with the wireless buzzer keystroke. Please only bid if you have prior experience working with Adobe Air and SWF.

I'm in need of a talented professional who can help me create a 360-degree virtual tour of my business office. This tour will be used for informational purposes. Key Requirements: - Development of a 360-degree virtual tour of our office space. - The tour should be interactive for users to explore the office environment. - Suitable for promoting our business and offering a virtual 'walk-through' experience. Desired Skills: - Prior experience in creating 360-degree virtual tours. - Ability to deliver an engaging, interactive and user-friendly virtual tour. I'm looking for someone who can transform our office space into a captivating virtual experience. Experience in similar projects would be a plus.

I'm in need of a talented and experienced landscape architect or designer to help me with the site design and layout services for... specifically around layout configuration - Ability to generate plans in a linear arrangement Deliverables: 1. Complete Site Design and Layout: The main focus is the RV slot configuration which has to follow a linear arrangement. 2. Detailed Blueprint: Submit a comprehensive plan showing the proposed layout that adheres to the specs and requirements stated. 3. Virtual Simulation (If Possible): Presenting a 3D model or any virtual simulation of the planned site design would be beneficial though not compulsory. This project promises to be exciting and I look forward to engaging creative minds who love orderliness and are knowledgeable about...

I am in need of a freelancer experienced in AutoCAD for a straightforward project. The task involves tracing or drawing over existing map lines in 2D using AutoCAD. This project is aimed at creating a digital copy of the map for reference